null

Seats Base Adapters & Covers

We offer a wide range of premium semi-truck seating options from industry leaders like Bostrom, Seats Inc., and Knoedler. Elevate your driving experience with our luxurious choices, including air ride, legacy, and aftermarket truck seats, all designed for maximum comfort during long hauls. Whether you drive a Peterbilt, Kenworth, Freightliner, or any major make, we have a variety of seats to choose from.
  • Product
  • Qty in Cart
  • Quantity
  • Price
  • Subtotal
  • FREE SHIPPING
    10 Inch Billet Alum. Seat Base Adapter For Bostrom Wide Ride & Seats Inc Legacy LO Seats For Kenworth T600

    10 Inch Billet Alum. Seat Base Adapter For Bostrom Wide Ride & Seats Inc Legacy LO Seats For Kenworth T600

    IOWA CUSTOMS

    $304.99 - $584.99
    The 10-Inch Billet Aluminum Seat Base Adapter for Bostrom Wide Ride and Seats Inc. Legacy Lo seats is an excellent choice for Kenworth truck owners. This adapter allows your seat to be positioned...
    PPR_201579
    SKU:
    PPR_201579
    Truck Class:
    Heavy Duty
    Material Options:
    Billet Aluminum
    Make:
    Kenworth
    Product Type:
    Seats
    Ready To Ship:
    Yes
    $304.99 - $584.99
    Qty in Cart: 0
    Price:
    $304.99 - $584.99
    Subtotal:
  • FREE SHIPPING
    Billet Aluminum Seat Base Adapter 12 Inch For Seats Inc. Legacy LO Seats-Post 07-01-2018

    Billet Aluminum Seat Base Adapter 12 Inch For Seats Inc. Legacy LO Seats-Post 07-01-2018

    IOWA CUSTOMS

    $327.99 - $605.99
    Maximize with the 12-Inch Billet Aluminum Seat Base Adapter, a game-changer for those looking to replace their seats with in Kenworth models such as the W900 and T800. This adapter is specifically...
    PPR_201578
    SKU:
    PPR_201578
    Truck Class:
    Heavy Duty
    Material Options:
    Billet Aluminum
    Make:
    Universal Items
    Make:
    Kenworth
    Product Type:
    Seats
    Ready To Ship:
    Yes
    $327.99 - $605.99
    Qty in Cart: 0
    Price:
    $327.99 - $605.99
    Subtotal:
  • FREE SHIPPING
    8 Inch Billet Aluminum Seat Base Adapter For National & Knoedler Seats For Kenworth

    8 Inch Billet Aluminum Seat Base Adapter For National & Knoedler Seats For Kenworth

    IOWA CUSTOMS

    $293.99 - $513.99
    Refresh your cab with the 8-Inch Billet Aluminum Seat Base Adapter for National Knoedler seats, a reliable solution for upgrading your Kenworth seating. This adapter is engineered specifically to...
    PPR_201577
    SKU:
    PPR_201577
    Truck Class:
    Heavy Duty
    Material Options:
    Billet Aluminum
    Make:
    Kenworth
    Product Type:
    Seats
    $293.99 - $513.99
    Qty in Cart: 0
    Price:
    $293.99 - $513.99
    Subtotal:
  • FREE SHIPPING
    10 Inch Billet Alum. Seat Base Adapter For National Ultra Ride 2000 Seats

    10 Inch Billet Alum. Seat Base Adapter For National Ultra Ride 2000 Seats

    IOWA CUSTOMS

    $299.99 - $583.99
    Upgrade your rig with the 10-Inch Billet Aluminum Seat Base Adapter designed for National Ultra Ride 2000 seats, an essential upgrade for Kenworth trucks, allowing for a significant enhancement in...
    PPR_201576
    SKU:
    PPR_201576
    Truck Class:
    Heavy Duty
    Material Options:
    Billet Aluminum
    Product Type:
    Seats
    Color:
    Red
    Length Options:
    7 1/2 Inch
    Color:
    Black
    Finish Options:
    Chrome-Plated
    Color:
    Yellow
    Width Options:
    10 Inch
    Color:
    Blue
    Height Options:
    2 3/4 Inch
    Make:
    Universal Items
    Ready To Ship:
    Yes
    $299.99 - $583.99
    Qty in Cart: 0
    Price:
    $299.99 - $583.99
    Subtotal:
  • FREE SHIPPING
    14 Inch Billet Alum. Seat Base Adapter For National Lo Pro Seats

    14 Inch Billet Alum. Seat Base Adapter For National Lo Pro Seats

    IOWA CUSTOMS

    $324.99 - $624.99
    Transform your setup with the 14-Inch Billet Aluminum Seat Base Adapter for National Lo-Pro seats, ideal for enhancing comfort in Kenworth truck models, including T800, W900, and many more. This...
    PPR_201575
    SKU:
    PPR_201575
    Truck Class:
    Heavy Duty
    Material Options:
    Billet Aluminum
    Make:
    Universal Items
    Make:
    Kenworth
    Product Type:
    Seats
    Ready To Ship:
    Yes
    $324.99 - $624.99
    Qty in Cart: 0
    Price:
    $324.99 - $624.99
    Subtotal:
  • FREE SHIPPING
    12 Inch Billet Aluminum Seat Base Adapter For Peterbilt 379, 386 & 389 Sears Atlas Seat W/O Riser

    12 Inch Billet Aluminum Seat Base Adapter For Peterbilt 379, 386 & 389 Sears Atlas Seat W/O Riser

    IOWA CUSTOMS

    $330.99 - $652.99
    The 12-Inch Billet Aluminum Seat Base Adapter for Sears Atlas seats is an essential upgrade for your Peterbilt truck, including models 379, 386 & 389. Designed for seamless installation, it provides...
    PPR_201574
    SKU:
    PPR_201574
    Truck Class:
    Heavy Duty
    Material Options:
    Billet Aluminum
    Make:
    Universal Items
    Finish Options:
    Chrome-Plated
    Material Options:
    Aluminum
    Make:
    Kenworth
    Product Type:
    Seats
    Ready To Ship:
    Yes
    $330.99 - $652.99
    Qty in Cart: 0
    Price:
    $330.99 - $652.99
    Subtotal:
  • FREE SHIPPING
    10 Inch Billet Alum. Seat Base Adapter For Seats Inc Legacy Gold & Silver Seats

    10 Inch Billet Alum. Seat Base Adapter For Seats Inc Legacy Gold & Silver Seats

    IOWA CUSTOMS

    $284.99 - $608.99
    Maximize your cab with the 10-Inch Billet Aluminum Seat Base Adapter, a premium solution for upgrading to aftermarket seats, specifically designed for Seats Inc. Legacy Gold and Silver Series...
    PPR_201573
    SKU:
    PPR_201573
    Truck Class:
    Heavy Duty
    Material Options:
    Billet Aluminum
    Make:
    Universal Items
    Make:
    Kenworth
    Make:
    Peterbilt
    Product Type:
    Seats
    Ready To Ship:
    Yes
    $284.99 - $608.99
    Qty in Cart: 0
    Price:
    $284.99 - $608.99
    Subtotal:
  • FREE SHIPPING
    10 Inch Billet Alum. Seat Base Adapter For Bostrom Wide Ride & Seats Inc. Legacy LO Seats-Pre 07-01-2018

    10 Inch Billet Alum. Seat Base Adapter For Bostrom Wide Ride & Seats Inc. Legacy LO Seats-Pre 07-01-2018

    IOWA CUSTOMS

    $305.99 - $565.99
    Add valuable leg room and simplify seat installation with this seat base adapter from Iowa Customs. Designed for low base applications, it allows compatible aftermarket and OEM style seats to be...
    PPR_201572
    SKU:
    PPR_201572
    Truck Class:
    Heavy Duty
    Material Options:
    Billet Aluminum
    Make:
    Universal Items
    Truck Class:
    Universal
    Product Type:
    Seats
    Ready To Ship:
    Yes
    Finish Options:
    Black Powder Coat
    Material Options:
    Aluminum
    Color:
    Yellow
    Location:
    Made In USA
    Color:
    Blue
    Finish Options:
    Powder Coat
    Finish Options:
    Chrome-Plated
    Width Options:
    10 Inch
    Style Options:
    Low Base
    $305.99 - $565.99
    Qty in Cart: 0
    Price:
    $305.99 - $565.99
    Subtotal:
  • FREE SHIPPING
    Iowa Customs 8 Inch Aluminum Seat Base Adapter W/ Color Options For Knoedler, National Seats, Sears Atlas W/ Riser & Bostrom Pro Ride W/ Standard Base

    Iowa Customs 8 Inch Aluminum Seat Base Adapter W/ Color Options For Knoedler, National Seats, Sears Atlas W/ Riser & Bostrom Pro Ride W/ Standard Base

    IOWA CUSTOMS

    $297.99 - $532.99
    Refresh your seating with the 8 Inch Billet Aluminum Seat Base Adapter designed for National and Knoedler seats. This top-notch adapter provides a reliable way to adapt aftermarket seating without...
    PPR_201571
    SKU:
    PPR_201571
    Truck Class:
    Heavy Duty
    Material Options:
    Billet Aluminum
    Make:
    Universal Items
    Make:
    Kenworth
    Product Type:
    Seats
    Ready To Ship:
    Yes
    $297.99 - $532.99
    Qty in Cart: 0
    Price:
    $297.99 - $532.99
    Subtotal:
  • FREE SHIPPING OVER $249
    Vinyl Leather Seat Belt Comfort Pad Covers

    Vinyl Leather Seat Belt Comfort Pad Covers

    GRAND GENERAL

    $24.79 - $25.31
    Enhance your driving comfort with the 3 x 10.375 Inch Vinyl Leather Seat Belt Comfort Pads. These stylish cushions are designed to prevent discomfort caused by seat belts rubbing against your...
    PPR_201570
    SKU:
    PPR_201570
    Truck Class:
    Heavy Duty
    Material Options:
    Vinyl
    Make:
    Universal Items
    Product Type:
    Seats
    $24.79 - $25.31
    Qty in Cart: 0
    Price:
    $24.79 - $25.31
    Subtotal:
  • Bostrom Pro Ride Semi-Truck Seat with Standard Base, High Back and Armrests - Ultra-Leather

    Bostrom Pro Ride Semi-Truck Seat with Standard Base, High Back and Armrests - Ultra-Leather

    BOSTROM TRUCK SEATS

    $1,244.99 - $1,526.99
    Upgrade your driving experience with the Bostrom Pro Ride Semi-Truck Seat with a Standard Base and High Back, made with ultra-leather. Designed specifically for Class 7 and 8 semi-trucks, this seat...
    PPR_201569
    SKU:
    PPR_201569
    Truck Class:
    Heavy Duty
    Style Options:
    High Back
    Material Options:
    Ultra Leather
    Make:
    Universal Items
    Type Options:
    Standard Base
    Product Type:
    Seats
    $1,244.99 - $1,526.99
    Qty in Cart: 0
    Price:
    $1,244.99 - $1,526.99
    Subtotal:
  • Bostrom Pro Ride Low Base High Back Seat With Armrests - Ultra-Leather

    Bostrom Pro Ride Low Base High Back Seat With Armrests - Ultra-Leather

    BOSTROM TRUCK SEATS

    $1,272.99 - $1,470.99
    Upgrade your experience with the Bostrom Pro Ride Low Base High Back Seat, designed for optimal comfort on long journeys. Upholstered in durable Ultra-Leather, this seat features a high back and dual...
    PPR_201568
    SKU:
    PPR_201568
    Truck Class:
    Heavy Duty
    Style Options:
    High Back
    Material Options:
    Ultra Leather
    Make:
    Universal Items
    Type Options:
    Low Base
    Product Type:
    Seats
    $1,272.99 - $1,470.99
    Qty in Cart: 0
    Price:
    $1,272.99 - $1,470.99
    Subtotal:
  • Bostrom Wide Ride Core Standard Base High Back Seat With Armrests - Ultra-Leather

    Bostrom Wide Ride Core Standard Base High Back Seat With Armrests - Ultra-Leather

    BOSTROM TRUCK SEATS

    $1,418.99 - $1,495.99
    Maximize your ride with the Bostrom Wide Ride Core Standard Base High Back Seat. Upholstered in Ultra-Leather, this seat not only provides a sleek and polished look but is also easy to maintain. The...
    PPR_201567
    SKU:
    PPR_201567
    Truck Class:
    Heavy Duty
    Style Options:
    High Back
    Material Options:
    Ultra Leather
    Make:
    Universal Items
    Type Options:
    Standard Base
    Product Type:
    Seats
    Ready To Ship:
    Yes
    $1,418.99 - $1,495.99
    Qty in Cart: 0
    Price:
    $1,418.99 - $1,495.99
    Subtotal:
  • Bostrom Wide Ride Core Low Base Mid-Back Seat With Armrests - Ultra-Leather

    Bostrom Wide Ride Core Low Base Mid-Back Seat With Armrests - Ultra-Leather

    BOSTROM TRUCK SEATS

    $1,343.99 - $1,539.99
    Enhance your comfort with the Bostrom Wide Ride Core Low Base Mid-Back Seat, featuring dual armrests and premium Ultra-Leather upholstery. Its isolating air suspension system features a 4-inch ride...
    PPR_201566
    SKU:
    PPR_201566
    Truck Class:
    Heavy Duty
    Material Options:
    Ultra Leather
    Make:
    Universal Items
    Product Type:
    Seats
    Color:
    Brown
    Color:
    Gray
    Location:
    Made In USA
    Color:
    Black
    Ready To Ship:
    Yes
    $1,343.99 - $1,539.99
    Qty in Cart: 0
    Price:
    $1,343.99 - $1,539.99
    Subtotal:
  • Bostrom Wide Ride Core Low Base High Back Seat With Armrests - Ultra-Leather

    Bostrom Wide Ride Core Low Base High Back Seat With Armrests - Ultra-Leather

    BOSTROM TRUCK SEATS

    $1,248.99 - $1,494.99
    Transform your rig with the Bostrom Wide Ride Core Low Base High Back Seat featuring dual armrests. This seat combines advanced engineering and premium materials, utilizing Ultra-Leather upholstery...
    PPR_201565
    SKU:
    PPR_201565
    Truck Class:
    Heavy Duty
    Style Options:
    High Back
    Material Options:
    Ultra Leather
    Make:
    Universal Items
    Type Options:
    Low Base
    Product Type:
    Seats
    $1,248.99 - $1,494.99
    Qty in Cart: 0
    Price:
    $1,248.99 - $1,494.99
    Subtotal:
  • Bostrom Wide Ride II Plus Serta Standard Base Mid-Back Seat With Armrests - Ultra-Leather

    Bostrom Wide Ride II Plus Serta Standard Base Mid-Back Seat With Armrests - Ultra-Leather

    BOSTROM TRUCK SEATS

    $1,412.99 - $1,541.99
    Elevate your driving experience with the Bostrom Wide Ride II Plus Serta Standard Base Mid-Back Seat featuring dual armrests. Crafted with Ultra-Leather, it features Serta's Cool Action Gel-infused...
    PPR_201564
    SKU:
    PPR_201564
    Truck Class:
    Heavy Duty
    Style Options:
    Mid Back
    Material Options:
    Ultra Leather
    Make:
    Universal Items
    Type Options:
    Standard Base
    Product Type:
    Seats
    Ready To Ship:
    Yes
    $1,412.99 - $1,541.99
    Qty in Cart: 0
    Price:
    $1,412.99 - $1,541.99
    Subtotal:
  • Bostrom Wide Ride II Plus Serta STD Base High Back Seat With Armrests - Ultra-Leather

    Bostrom Wide Ride II Plus Serta STD Base High Back Seat With Armrests - Ultra-Leather

    BOSTROM TRUCK SEATS

    $1,529.99 - $1,726.99
    Experience unparalleled comfort on the road with the Bostrom Wide Ride II Plus Serta High Back Seat. Crafted with Ultra-Leather, this seat features a high back and dual armrests, providing a...
    PPR_201563
    SKU:
    PPR_201563
    Truck Class:
    Heavy Duty
    Style Options:
    High Back
    Material Options:
    Ultra Leather
    Type Options:
    Standard Base
    Product Type:
    Seats
    Ready To Ship:
    Yes
    Color:
    Gray
    Location:
    Made In USA
    Color:
    Black
    Width Options:
    23 Inch
    Color:
    Brown
    Make:
    Universal Items
    $1,529.99 - $1,726.99
    Qty in Cart: 0
    Price:
    $1,529.99 - $1,726.99
    Subtotal:
  • Bostrom Wide Ride II Plus Serta Low Base Mid-Back Seat With Armrests - Ultra-Leather

    Bostrom Wide Ride II Plus Serta Low Base Mid-Back Seat With Armrests - Ultra-Leather

    BOSTROM TRUCK SEATS

    $1,337.99 - $1,531.99
    Upgrade your driving comfort with the Wide Ride Plus Mid Back truck seat, designed to provide lasting support for long days on the road. Featuring a spacious 23 inch wide seating surface, advanced...
    PPR_201562
    SKU:
    PPR_201562
    Truck Class:
    Heavy Duty
    Material Options:
    Ultra Leather
    Make:
    Universal Items
    Product Type:
    Seats
    Color:
    Blue
    Color:
    Black
    Location:
    Made In USA
    Color:
    Gray
    Width Options:
    23 Inch
    Color:
    Tan
    Type Options:
    Mid Back
    Style Options:
    LoPro Suspension
    Ready To Ship:
    Yes
    $1,337.99 - $1,531.99
    Qty in Cart: 0
    Price:
    $1,337.99 - $1,531.99
    Subtotal:
  • Bostrom Wide Ride II Plus Serta Low Base High Back Seat W/ Armrests - Ultra Leather For Freightliner, International, Kenworth, Peterbilt & Western Star

    Bostrom Wide Ride II Plus Serta Low Base High Back Seat W/ Armrests - Ultra Leather For Freightliner, International, Kenworth, Peterbilt & Western Star

    BOSTROM TRUCK SEATS

    $1,386.99 - $1,789.99
    Experience premium comfort on every mile with the Wide Ride Plus truck seat. Designed for professional drivers, this seat combines advanced air suspension, memory foam cushioning, lumbar support, and...
    PPR_201561
    SKU:
    PPR_201561
    Truck Class:
    Heavy Duty
    Location:
    Made In USA
    Make:
    Kenworth
    Make:
    Freightliner
    Make:
    International
    Make:
    Peterbilt
    Make:
    Western Star
    Make:
    Mack
    Product Type:
    Seats
    Ready To Ship:
    Yes
    Color:
    Black
    Material Options:
    Ultra Leather
    Color:
    Brown
    Color:
    Gray
    Style Options:
    High Back
    Width Options:
    23 Inch
    Material Options:
    Cloth
    $1,386.99 - $1,789.99
    Qty in Cart: 0
    Price:
    $1,386.99 - $1,789.99
    Subtotal:
  • National Corsair & 2000 Series Replacement Armrest - Black Ultra-Leather

    National Corsair & 2000 Series Replacement Armrest - Black Ultra-Leather

    NATIONAL SEATING

    $132.99 - $161.99
    Upgrade your seating with the National Seating Corsair & 2000 Series Replacement Armrest. This high-quality armrest is designed for National Corsair and 2000 Series seats and features a durable black...
    PPR_201313
    SKU:
    PPR_201313
    Truck Class:
    Heavy Duty
    Color:
    Black
    Material Options:
    Ultra Leather
    Make:
    Universal Items
    Product Type:
    Seats
    $132.99 - $161.99
    Qty in Cart: 0
    Price:
    $132.99 - $161.99
    Subtotal:
  • Total: items /

Adding your products to cart

Here's the truth: investing those hard-earned dollars into aftermarket seating can fundamentally transform your driving experience. You can reduce your fatigue and get better lumbar support. That’s why we offer some of the best semi truck seats and accessories in the industry—built for comfort, durability, and long-haul performance. Whether you drive a Peterbilt, Kenworth, Freightliner, or another rig, you’ll find options that match your truck’s specs and your personal style.

Luxury Big Rig Seating Options

From air ride seats to universal semi truck seats and custom seat bases, we’ve got your backside covered. Choose your style and setup: - High-back, mid-back, and low-profile seats for every body type and cab layout. - Air ride seats for long-haul comfort, smoother suspension, and adjustable positioning. - Heated and cooled seat options to beat the heat or fight off the chill on extreme routes. - Ergonomic designs to ease back discomfort and promote better posture.

The Top Features

Material Matters Pick from cloth, faux leather, or genuine leather depending on your budget and the kind of road life you live. All built to handle real miles—not showroom fluff. Stylish & Functional Covers Dress up your seat with sleek two-tone seat covers, stitched accents, and built-in back pockets for on-the-go storage. Custom Base Adapters Mount your seat the right way with base adapters built for Seats Inc. Legacy, Sears Atlas, Bostrom, and more. Available in billet aluminum, gloss black, chrome, and custom powder-coat finishes.

Comfortable Accessories

Small upgrades with big difference: - Armrest covers for all-day elbow comfort - Lumbar support cushions to save your spine - Seat organizers to keep your essentials right where you need them

Get the Perfect Commercial Truck Seat

Check out our complete aftermarket semi truck seating guide to learn how to choose the right seat for your setup. Almost every new seat is going to need an adapter, unless it's a standard base unit. Let's say you have a mid-range truck, like a Freightliner M2 model; typically, those don't have a flat floor but a bit of a hump in the middle. That means you'll need a specific adapter and commercial truck seat that has a low-profile midback so you don't hit the roof. Lucky for you, our product selection is vast!

Why Shop Our Semi Truck Seating?

- Wide compatibility with Peterbilt, Freightliner, Kenworth, Volvo, and more. - Universal fitment options for hard-to-match setups. - Direct replacement or upgrade-ready seats and hardware. - Everyday low prices without sacrificing quality. - Real support from truck parts experts who understand your cab setup.

Start Driving in Comfort

A high-quality seat isn’t a luxury—it’s a necessity. Upgrade your semi truck seat, mount it with confidence, and finish it off with stylish covers and accessories that last. Shop the best semi truck seats and seating accessories today—and take the pressure off your back for the long haul.

Frequently Asked Questions About Semi-Truck Seats, Base Adapters & Covers

Will these seats fit my specific truck model and year?

Most aftermarket semi-truck seats are designed with universal mounting patterns that fit standard truck bases from manufacturers like Peterbilt, Kenworth, Freightliner, Volvo, and Mack. However, some trucks require specific base adapters. Check your current seat's bolt pattern (typically measured center-to-center) and compare it to the seat specifications. Common patterns include 8" x 8" and 11" x 11". If you're unsure, measure your existing seat base or contact us with your truck's year, make, and model for verification.

How difficult is it to install a new seat or base adapter?

Installation typically takes 30-60 minutes per seat with basic hand tools. You'll need a socket set, wrenches, and possibly a drill for certain adapters. The process involves unbolting the old seat, potentially installing a base adapter if needed, and bolting in the new seat. Most seats come with installation instructions. Common challenges include accessing tight bolts and ensuring proper electrical connections for air-ride seats. Professional installation is recommended if you're uncomfortable working with air lines or electrical connections.

What's the difference between vinyl, cloth, and leather seat materials?

Vinyl seats are the most durable and easiest to clean, making them ideal for drivers who eat in their trucks or haul dirty loads. They resist stains and spills but can get hot in summer and cold in winter. Cloth seats breathe better and provide more comfort in extreme temperatures but require more maintenance and are harder to clean. Leather offers premium comfort and appearance but needs regular conditioning and costs more. Consider your climate, maintenance preferences, and how many hours you spend in the seat daily when choosing.

Do I need a suspension base or air-ride system for my seat?

If you drive more than 6 hours daily or frequently travel rough roads, a suspension or air-ride seat significantly reduces fatigue and back pain. Air-ride seats offer the best vibration dampening and adjustability but require an air supply connection. Mechanical suspension seats provide good comfort without needing air hookups. Static (non-suspension) seats work for local drivers or backup seats but aren't recommended for long-haul use. Consider your driving conditions and health needs when deciding.

Will aftermarket seat covers fit my existing seats properly?

Universal seat covers work for most standard semi-truck seats but may require some adjustment for a snug fit. Look for covers with elastic bands, drawstrings, or hook-and-loop fasteners for better fitment. Measure your seat's backrest height, width, and cushion dimensions before ordering. Custom-fit covers are available for popular seat models like Bostrom, National, and Sears seating. Avoid covers that interfere with seat adjustment controls or armrest movement. For air-ride seats, ensure covers don't block ventilation ports.


Introducing the Official 4 State Trucks Mobile App – Gear Up On the Go!