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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.
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  • Aluminum National Seat Lo Base Adapter Plate

    Aluminum National Seat Lo Base Adapter Plate

    ROCKWOOD

    $224.99 - $378.99
    Choose Option(s) to see description.Factory Position Sanded Aluminum Seat Base Adapter Plate For National Lo Pro SeatNational Seat Lo Base Adapter PlateThis Polished Billet Aluminum Seat Base Adaptor...
    PPR_206258
    SKU:
    PPR_206258
    Truck Class:
    Universal
    Make:
    Universal Items
    Material Options:
    Billet Aluminum
    Truck Class:
    Heavy Duty
    Product Type:
    Seats
    $224.99 - $378.99
    Qty in Cart: 0
    Price:
    $224.99 - $378.99
    Subtotal:
  • Billet Aluminum Seat Base Adapter For Bostrom Low Pro Seats

    Billet Aluminum Seat Base Adapter For Bostrom Low Pro Seats

    ROCKWOOD

    $224.99 - $347.99
    Choose Option(s) to see description.Fitment** Universal - Fits Multiple Makes & Models Of TrucksBillet Aluminum Seat Base Adapter, 1 Inch Back From Factory Mounting For Bostrom Wide Ride & Pro Ride...
    PPR_206257
    SKU:
    PPR_206257
    Truck Class:
    Universal
    Make:
    Universal Items
    Material Options:
    Aluminum
    Material Options:
    Billet Aluminum
    Truck Class:
    Heavy Duty
    Product Type:
    Seats
    $224.99 - $347.99
    Qty in Cart: 0
    Price:
    $224.99 - $347.99
    Subtotal:
  • FREE SHIPPING OVER $249
    Seat Base Adapter, 11 Gauge Stainless Steel For Bostrom Proride

    Seat Base Adapter, 11 Gauge Stainless Steel For Bostrom Proride

    TWELVE GAUGE

    $183.99
    SS Bostrom Proride Seat Base Adapter By 12 Ga.* High Quality Seat Base Adapter* Made Of 11 Gauge Stainless Steel* Sold Individually* Warranty On Seat Base Adapters Against Defects In Workmanship &...
    09-1920008
    SKU:
    09-1920008
    Truck Class:
    Heavy Duty
    Material Options:
    Stainless Steel
    Make:
    Universal Items
    Product Type:
    Seats
    $183.99
    Qty in Cart: 0
    Price:
    $183.99
    Subtotal:
  • Bostrom Semi-Truck Seat - Mid-Back W/ Black Ultra Leather & Without Arm Rest

    Bostrom Semi-Truck Seat - Mid-Back W/ Black Ultra Leather & Without Arm Rest

    BOSTROM TRUCK SEATS

    $1,095.99
    Black Ultra Leather Mid Back Seat Without Arm RestThe Lo Pro Midback Black Ultra Leather seat is a great choice for professional drivers. Its ergonomic cushions and Flex Support System offer optimal...
    9230010900
    SKU:
    9230010900
    Truck Class:
    Heavy Duty
    Color:
    Black
    Material Options:
    Ultra Leather
    Make:
    Universal Items
    Style Options:
    Mid Back
    Type Options:
    Low Base
    Product Type:
    Seats
    Ready To Ship:
    Yes
    $1,095.99
    Qty in Cart: 0
    Price:
    $1,095.99
    Subtotal:
  • Bostrom Pro Ride Lower Seat Cushion - Foam Only

    Bostrom Pro Ride Lower Seat Cushion - Foam Only

    BOSTROM TRUCK SEATS

    $126.99
    Replacement Bostrom Pro Ride Lower Seat CushionIs the lower cushion on your Bostrom Pro Ride Seat worn, torn, tired, or in need a change? This replacement foam cushion is easy to change out from the...
    6204469001
    SKU:
    6204469001
    Truck Class:
    Heavy Duty
    Make:
    Universal Items
    Product Type:
    Seats
    $126.99
    Qty in Cart: 0
    Price:
    $126.99
    Subtotal:
  • Seat Base For GMC TopKick 2005

    Seat Base For GMC TopKick 2005

    NATIONAL SEATING

    $477.99
    Seat Base Fits GMC TopKick 2005* High Quality Seat Base* Made In USA* Sold Individually* Warranty On Seat Bases Against Defects In Workmanship & Material From Date Of Purchase*** High Quality...
    SK1491
    SKU:
    SK1491
    Truck Class:
    Heavy Duty
    Material Options:
    Steel
    Make:
    GMC
    Product Type:
    Seats
    $477.99
    Qty in Cart: 0
    Price:
    $477.99
    Subtotal:
  • FREE SHIPPING OVER $249
    National Seat Base Adapter For International Durastar, Lonestar, Prostar

    National Seat Base Adapter For International Durastar, Lonestar, Prostar

    NATIONAL SEATING

    $138.99
    National Seat Base Adapter W/ Wide Seat Base Mounting Patterns* High Quality Seat Base Adapter* With Wide Seat Base Mounting Patterns* For Installing National Standard Base Seats* Made In USA* Sold...
    SK1600
    SKU:
    SK1600
    Truck Class:
    Heavy Duty
    Material Options:
    Steel
    Make:
    Universal Items
    Product Type:
    Seats
    $138.99
    Qty in Cart: 0
    Price:
    $138.99
    Subtotal:
  • Bostrom Gray Pro Ride Seat W/ Mid Back And Low Profile And W/ Out Arm Rests

    Bostrom Gray Pro Ride Seat W/ Mid Back And Low Profile And W/ Out Arm Rests

    BOSTROM TRUCK SEATS

    $1,094.99
    Bostrom Ultraleather Pro Ride W/ Mid Back And Low Profile And W/ Out Arm Rests* High Quality Seat* Ultraleather* Gray* With MID Back * Low Profile Base * Without Armrest* Sold Individually* Warranty...
    9230010902
    SKU:
    9230010902
    Truck Class:
    Heavy Duty
    Style Options:
    Mid Back
    Material Options:
    Ultra Leather
    Make:
    Universal Items
    Type Options:
    Low Base
    Product Type:
    Seats
    $1,094.99
    Qty in Cart: 0
    Price:
    $1,094.99
    Subtotal:
  • FREE SHIPPING OVER $249
    Bostrom Control Handle Kit

    Bostrom Control Handle Kit

    BOSTROM TRUCK SEATS

    $68.99
    Bostrom Control Handle Kit* High Quality Control Handle Kit* Control Handle Kit  - 1 Control Handle Assembly  - 1 Spring Lockout  - 1 Hex Head- Shoulder  - 1 Belleville Washer  - 1 Nut Hex  - 1...
    6222134001
    SKU:
    6222134001
    Truck Class:
    Heavy Duty
    Material Options:
    Steel
    Make:
    Universal Items
    Product Type:
    Seats
    $68.99
    Qty in Cart: 0
    Price:
    $68.99
    Subtotal:
  • FREE SHIPPING OVER $249
    Bostrom Control Handle Kit W/ Spring And Hardware For Bostrom T Series

    Bostrom Control Handle Kit W/ Spring And Hardware For Bostrom T Series

    BOSTROM TRUCK SEATS

    $48.87
    Bostrom Control Handle Kit W/ Spring And Hardware* High Quality Control Handle Replacement* Includes   - Replacement Handle Assembly  - Spring And Hardware* Slide And Isolator * Sold Individually*...
    6222072001
    SKU:
    6222072001
    Truck Class:
    Heavy Duty
    Material Options:
    Steel
    Make:
    Universal Items
    Product Type:
    Seats
    $48.87
    Qty in Cart: 0
    Price:
    $48.87
    Subtotal:
  • Widride II Plus Serta Ultraleather Red And Tan Low Base High Back Truck Seat With Dual Arm Rests & Driver Side Swivel - Red & Tan

    Widride II Plus Serta Ultraleather Red And Tan Low Base High Back Truck Seat With Dual Arm Rests & Driver Side Swivel - Red & Tan

    NATIONAL SEATING

    $1,411.99
    Ultraleather Seat W/ Bellows And Gel Infused Memory Foam CushionGet ready for comfort with the Wideride II Plus Serta Truck Seat! It features a low base, high back, and dual armrests, along with a...
    5100101N02
    SKU:
    5100101N02
    Truck Class:
    Heavy Duty
    Color:
    Brown
    Style Options:
    High Back
    Material Options:
    Ultra Leather
    Make:
    Universal Items
    Type Options:
    Low Base
    Product Type:
    Seats
    $1,411.99
    Qty in Cart: 0
    Price:
    $1,411.99
    Subtotal:
  • Seats Inc Legacy LO Black Dura-Leather Mid Back Low Base Truck Seat With EZ Adjust Armrests

    Seats Inc Legacy LO Black Dura-Leather Mid Back Low Base Truck Seat With EZ Adjust Armrests

    SEATS INC

    $1,332.99
    Black DuraLeather Legacy LO Mid Back Seat With Quadra-Pivot SuspensionGet ready to hit the road in style and comfort! This Legacy Lo Mid Back truck seat is designed with D2 foam technology, giving...
    188598MW61
    SKU:
    188598MW61
    Truck Class:
    Heavy Duty
    Style Options:
    Mid Back
    Material Options:
    DuraLeather
    Type Options:
    Low Base
    Product Type:
    Seats
    Color:
    Black
    Height Options:
    45 Inch
    Width Options:
    25 Inch
    Make:
    Universal Items
    Ready To Ship:
    Yes
    $1,332.99
    Qty in Cart: 0
    Price:
    $1,332.99
    Subtotal:
  • Air Spring Seat Bag For A National Seat

    Air Spring Seat Bag For A National Seat

    AUTOMANN USA

    $44.93
    Air Spring Seat BagMaintain driver comfort and reduce fatigue with the Air Spring Seat Bag for a National Seat, engineered to deliver superior shock absorption and support. This high-quality air...
    09-192000147
    SKU:
    09-192000147
    Truck Class:
    Heavy Duty
    Material Options:
    Rubber
    Make:
    Universal Items
    Product Type:
    Seats
    $44.93
    Qty in Cart: 0
    Price:
    $44.93
    Subtotal:
  • Gray Fabric Seat Cushion, 20 1/3 x 19 1/3 x 5 1/2 Inch For Isuzu NPR

    Gray Fabric Seat Cushion, 20 1/3 x 19 1/3 x 5 1/2 Inch For Isuzu NPR

    DAYTON / DORMAN

    $295.99
    Gray Fabric Bolt On Seat Cushion* High Quality Seat Cushion* Fabric* Gray* 20.3 Inch Length* 5.5 Inch Thickness* 19.3 Inch Width* Attachment Method- Bolt On* Cover Included* Inner Padding Material-...
    08-19200000
    SKU:
    08-19200000
    Color:
    Gray
    Truck Class:
    Heavy Duty
    Material Options:
    Cloth
    Make:
    Isuzu
    Product Type:
    Seats
    $295.99
    Qty in Cart: 0
    Price:
    $295.99
    Subtotal:
  • On Sale
    Limited Quantity Available
    Chugger Kit For National Seat

    Chugger Kit For National Seat

    NATIONAL SEATING

    Now: $17.07
    Was: $60.99
    National Seat Chugger Kit* High Quality Chugger Kit* Made In USA* Sold Individually* Warranty On Chugger Kits Against Defects In Workmanship & Material From Date Of Purchase*** High Quality...
    SK96505
    SKU:
    SK96505
    Truck Class:
    Heavy Duty
    Location:
    Made In USA
    Material Options:
    Steel
    Make:
    Universal Items
    Product Type:
    Seats
    Ready To Ship:
    Yes
    Now: $17.07
    Was: $60.99
    Qty in Cart: 0
    Price:
    Now: $17.07
    Was: $60.99
    Subtotal:
  • National Seating Air Bag Kit For Low Base Replaces Firestone 2123403

    National Seating Air Bag Kit For Low Base Replaces Firestone 2123403

    BOSTROM TRUCK SEATS

    $99.99
    Heavy Duty Replacement Air Spring For Low Profile National Air Suspension Base* High Quality Replacement Air Bag* For National Seats With Low Base* Sold Individually* Warranty On Replacement Air Bag...
    SK777
    SKU:
    SK777
    Truck Class:
    Heavy Duty
    Make:
    Universal Items
    Type Options:
    Low Base
    Product Type:
    Seats
    $99.99
    Qty in Cart: 0
    Price:
    $99.99
    Subtotal:
  • Seat Adapter Plate For Ford F Series 1984-2018

    Seat Adapter Plate For Ford F Series 1984-2018

    NATIONAL SEATING

    $221.99
    Seat Adapter Plate Fits Ford F SeriesAre you about to install a suspension seat by National Seating in a 1984 through 2018 Ford F Series Model? 4 State Trucks offers this high quality adaptor plate...
    SK1660
    SKU:
    SK1660
    Truck Class:
    Heavy Duty
    Make:
    Ford
    Product Type:
    Seats
    $221.99
    Qty in Cart: 0
    Price:
    $221.99
    Subtotal:
  • Seat Adapter Plate For Freightliner M2 Models

    Seat Adapter Plate For Freightliner M2 Models

    NATIONAL SEATING

    $167.99
    Freightliner M2 Seat Adapter Plate* High Quality Seat Adapter Plate* Made In USA* Sold Individually* Warranty On Seat Adapter Plates Against Defects In Workmanship & Material From Date Of Purchase***...
    SK1659
    SKU:
    SK1659
    Truck Class:
    Heavy Duty
    Location:
    Made In USA
    Material Options:
    Steel
    Make:
    Freightliner
    Product Type:
    Seats
    $167.99
    Qty in Cart: 0
    Price:
    $167.99
    Subtotal:
  • FREE SHIPPING
    National Low-Profile Semi-Truck Seat Base

    National Low-Profile Semi-Truck Seat Base

    NATIONAL SEATING

    $474.99
    LoPro Seat Base For National SeatThis Low mount seat base if for National Seats only. The top of base from floor measures 6.25 inches when fully extended to 3.43 inches when compressed. It will not...
    SK1506
    SKU:
    SK1506
    Truck Class:
    Heavy Duty
    Make:
    Universal Items
    Type Options:
    Low Base
    Product Type:
    Seats
    $474.99
    Qty in Cart: 0
    Price:
    $474.99
    Subtotal:
  • National Seating Self-Contained External Compressor Kit For Installing Air Ride Seats W/O Onboard Air System

    National Seating Self-Contained External Compressor Kit For Installing Air Ride Seats W/O Onboard Air System

    NATIONAL SEATING

    $699.99
    Self-Contained External Compressor Kit For Installing National Seating Air Ride Seats* High Quality External Compressor Kit* For Installing Air Ride Seats In Trucks Without Onboard Air Systems* Made...
    SK1483
    SKU:
    SK1483
    Truck Class:
    Heavy Duty
    Location:
    Made In USA
    Make:
    Universal Items
    Product Type:
    Seats
    $699.99
    Qty in Cart: 0
    Price:
    $699.99
    Subtotal:
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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.


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