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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.
  • Product
  • Qty in Cart
  • Quantity
  • Price
  • Subtotal
  • Oasis Tan Vinyl Captain Air Low Back Seat Standard Base W/ Arm Rest, Air Lumbar Support, Back Cycler, W/O Back Cycler, & Bellows

    Oasis Tan Vinyl Captain Air Low Back Seat Standard Base W/ Arm Rest, Air Lumbar Support, Back Cycler, W/O Back Cycler, & Bellows

    NATIONAL SEATING

    $892.99
    Captain Air Standard Seat Oasis Tan Vinyl* High Quality Seat* Captain* Oasis Tan* Made Of Vinyl* Low Back* Standard Base* With 2 Ratcheting Style 15 Inch Arm Rest* Without Suspension Cover- Bellows*...
    50766304
    SKU:
    50766304
    Color:
    Tan
    Truck Class:
    Heavy Duty
    Style Options:
    Low Back
    Material Options:
    Vinyl
    Make:
    Universal Items
    Type Options:
    Standard Base
    Product Type:
    Seats
    $892.99
    Qty in Cart: 0
    Price:
    $892.99
    Subtotal:
  • Opal Gray Vinyl Captain Air Low Back Seat Standard Base W/ Arm Rest, Air Lumbar Support, Back Cycler, W/O Back Cycler, & Bellows

    Opal Gray Vinyl Captain Air Low Back Seat Standard Base W/ Arm Rest, Air Lumbar Support, Back Cycler, W/O Back Cycler, & Bellows

    NATIONAL SEATING

    $794.99
    Captain Air Standard Seat Opal Gray Vinyl* High Quality Seat* Captain* Opal Gray* Made Of Vinyl* Low Back* Standard Base* With 2 Ratcheting Style 15 Inch Arm Rest* Without Suspension Cover- Bellows*...
    50766301
    SKU:
    50766301
    Truck Class:
    Heavy Duty
    Style Options:
    Low Back
    Material Options:
    Vinyl
    Make:
    Universal Items
    Type Options:
    Standard Base
    Product Type:
    Seats
    $794.99
    Qty in Cart: 0
    Price:
    $794.99
    Subtotal:
  • National Captain Chocolate Brown Mordura Cloth Standard Base Seat Low Back

    National Captain Chocolate Brown Mordura Cloth Standard Base Seat Low Back

    NATIONAL SEATING

    $889.99
    Captain Air Standard Seat Chocolate Brown Mordura Cloth* High Quality Seat* Captain* Chocolate Brown* Modura Cloth* Low Back* Standard Base* Without Arm Rests* Without Suspension Cover- Bellows*...
    50766069
    SKU:
    50766069
    Truck Class:
    Heavy Duty
    Style Options:
    Low Back
    Material Options:
    Cloth
    Make:
    Universal Items
    Type Options:
    Standard Base
    Product Type:
    Seats
    $889.99
    Qty in Cart: 0
    Price:
    $889.99
    Subtotal:
  • Black & Tan 2 Tone Mordura Cloth Captain Air Low Back Seat Standard Base W/ Air Lumbar Support, Bellows, Standard Damper, & W/O Arm Rests & Back Cycler

    Black & Tan 2 Tone Mordura Cloth Captain Air Low Back Seat Standard Base W/ Air Lumbar Support, Bellows, Standard Damper, & W/O Arm Rests & Back Cycler

    NATIONAL SEATING

    $505.99
    2 Tone Mordura Cloth Captain Air Seat Black & Tan* High Quality Seat* Captain* Black-Tan 2 Tone* Modura Cloth* Low Back* Standard Base* Without Arm Rests* Without Suspension Cover- Bellows* Without...
    50766067
    SKU:
    50766067
    Color:
    Black
    Truck Class:
    Heavy Duty
    Style Options:
    Low Back
    Material Options:
    Cloth
    Make:
    Universal Items
    Type Options:
    Standard Base
    Product Type:
    Seats
    $505.99
    Qty in Cart: 0
    Price:
    $505.99
    Subtotal:
  • Captain Air Low Back Seat Standard Base W/ Air Lumbar Support, Bellows, Extendable Cushion, & W/O Arm Rests & Back Cycler -Black & Gray 2 Tone Mordura Cloth

    Captain Air Low Back Seat Standard Base W/ Air Lumbar Support, Bellows, Extendable Cushion, & W/O Arm Rests & Back Cycler -Black & Gray 2 Tone Mordura Cloth

    NATIONAL SEATING

    $505.99
    2 Tone Mordura Cloth Captain Air Seat Black & Gray* High Quality Seat* Captain* Black-Gray 2 Tone* Modura Cloth* Low Back* Standard Base* Without Arm Rests* Without Suspension Cover- Bellows* Without...
    50766066
    SKU:
    50766066
    Color:
    Black
    Truck Class:
    Heavy Duty
    Style Options:
    Low Back
    Material Options:
    Cloth
    Make:
    Universal Items
    Type Options:
    Standard Base
    Product Type:
    Seats
    $505.99
    Qty in Cart: 0
    Price:
    $505.99
    Subtotal:
  • Black Mordura Cloth Captain Air Low Back Seat Standard Base W/ Standard Damper, Air Lumbar Support, Back Cycler & W/O Arm Rests & Back Cycler

    Black Mordura Cloth Captain Air Low Back Seat Standard Base W/ Standard Damper, Air Lumbar Support, Back Cycler & W/O Arm Rests & Back Cycler

    NATIONAL SEATING

    $756.99
    Captain Air Standard Seat Black Mordura Cloth* High Quality Seat* Captain* Black* Modura Cloth* Low Back* Standard Base* Without Arm Rests* Without Suspension Cover- Bellows* Without Back Cycler*...
    50766065
    SKU:
    50766065
    Truck Class:
    Heavy Duty
    Style Options:
    Low Back
    Material Options:
    Cloth
    Make:
    Universal Items
    Type Options:
    Standard Base
    Product Type:
    Seats
    $756.99
    Qty in Cart: 0
    Price:
    $756.99
    Subtotal:
  • National Captain Standard Base Low Back Air Seat With Armrests - Tan Mordura Cloth

    National Captain Standard Base Low Back Air Seat With Armrests - Tan Mordura Cloth

    NATIONAL SEATING

    $810.99
    Captain HiPro 95 Air Suspension Low-Back Air Lumbar Seat With Dual ArmrestsDo you need a cost effective and comfortable low back suspension seat? 4 State Trucks is proud to offer this affordable low...
    50766064
    SKU:
    50766064
    Truck Class:
    Heavy Duty
    Color:
    Tan
    Style Options:
    Low Back
    Material Options:
    Cloth
    Make:
    Universal Items
    Type Options:
    Standard Base
    Product Type:
    Seats
    $810.99
    Qty in Cart: 0
    Price:
    $810.99
    Subtotal:
  • Orient Blue Mordura Cloth Captain Air Low Back Seat Standard Base W/ Standard Damper, , Back Cycler, Air Lumbar Support, & W/O Arm Rests & Back Cycler

    Orient Blue Mordura Cloth Captain Air Low Back Seat Standard Base W/ Standard Damper, , Back Cycler, Air Lumbar Support, & W/O Arm Rests & Back Cycler

    NATIONAL SEATING

    $749.99
    Captain Air Standard Seat Orient Blue Mordura Cloth* High Quality Seat* Captain* Orient Blue* Modura Cloth* Low Back* Standard Base* Without Arm Rests* Without Suspension Cover- Bellows* Without Back...
    50766063
    SKU:
    50766063
    Truck Class:
    Heavy Duty
    Style Options:
    Low Back
    Material Options:
    Cloth
    Make:
    Universal Items
    Type Options:
    Standard Base
    Product Type:
    Seats
    $749.99
    Qty in Cart: 0
    Price:
    $749.99
    Subtotal:
  • Cajun Red Mordura Cloth Captain Air Low Back Seat Standard Base W/ Standard Damper, , Back Cycler, Air Lumbar Support, & W/O Arm Rests & Back Cycler

    Cajun Red Mordura Cloth Captain Air Low Back Seat Standard Base W/ Standard Damper, , Back Cycler, Air Lumbar Support, & W/O Arm Rests & Back Cycler

    NATIONAL SEATING

    $560.99
    Captain Air Standard Seat Cajun Red Mordura Cloth* High Quality Seat* Captain* Cajun Red* Modura Cloth* Low Back* Standard Base* Without Arm Rests* Without Suspension Cover- Bellows* Without Back...
    50766062
    SKU:
    50766062
    Truck Class:
    Heavy Duty
    Style Options:
    Low Back
    Material Options:
    Cloth
    Make:
    Universal Items
    Type Options:
    Standard Base
    Product Type:
    Seats
    $560.99
    Qty in Cart: 0
    Price:
    $560.99
    Subtotal:
  • National Captain Medium Gray Mordura Cloth Standard Base Seat Low Back

    National Captain Medium Gray Mordura Cloth Standard Base Seat Low Back

    NATIONAL SEATING

    $735.99
    Captain Air Standard Seat Medium Gray Mordura Cloth* High Quality Seat* Captain* Medium Gray* Modura Cloth* Low Back* Standard Base* Without Arm Rests* Without Suspension Cover- Bellows* Without Back...
    50766061
    SKU:
    50766061
    Truck Class:
    Heavy Duty
    Style Options:
    Low Back
    Material Options:
    Cloth
    Make:
    Universal Items
    Type Options:
    Standard Base
    Product Type:
    Seats
    $735.99
    Qty in Cart: 0
    Price:
    $735.99
    Subtotal:
  • Rascal Black Vinyl Captain Air Low Back Seat Standard Base W/ Standard Damper, , Back Cycler, Air Lumbar Support, & W/O Arm Rests & Back Cycler

    Rascal Black Vinyl Captain Air Low Back Seat Standard Base W/ Standard Damper, , Back Cycler, Air Lumbar Support, & W/O Arm Rests & Back Cycler

    NATIONAL SEATING

    $640.99
    Captain Air Standard Seat Rascal Black Vinyl* High Quality Seat* Captain* Rascal Black* Made Of Vinyl* Low Back* Standard Base* Without Arm Rests* Without Suspension Cover- Bellows* Without Back...
    50766005
    SKU:
    50766005
    Truck Class:
    Heavy Duty
    Style Options:
    Low Back
    Material Options:
    Vinyl
    Make:
    Universal Items
    Type Options:
    Standard Base
    Product Type:
    Seats
    $640.99
    Qty in Cart: 0
    Price:
    $640.99
    Subtotal:
  • Opal Gray Vinyl Captain Air Low Back Seat W/ Air Lumbar

    Opal Gray Vinyl Captain Air Low Back Seat W/ Air Lumbar

    NATIONAL SEATING

    $723.99
    Captain Air Standard Seat Opal Gray Vinyl* High Quality Seat* Captain* Opal Gray* Made Of Vinyl* Low Back* Standard Base* Without Arm Rests* Without Suspension Cover- Bellows* Without Back Cycler*...
    50766001
    SKU:
    50766001
    Truck Class:
    Heavy Duty
    Style Options:
    Low Back
    Material Options:
    Vinyl
    Make:
    Universal Items
    Type Options:
    Standard Base
    Product Type:
    Seats
    $723.99
    Qty in Cart: 0
    Price:
    $723.99
    Subtotal:
  • Parchment Tan Mordura Cloth Captain Air Mid Back Seat Standard Base W/ Arm Rest, Air Lumbar Support, Back Cycler, W/O Back Cycler, & Bellows

    Parchment Tan Mordura Cloth Captain Air Mid Back Seat Standard Base W/ Arm Rest, Air Lumbar Support, Back Cycler, W/O Back Cycler, & Bellows

    NATIONAL SEATING

    $791.99
    Captain Air Standard Seat Parchment Tan Mordura Cloth* High Quality Seat* Captain* Parchment Tan* Modura Cloth* Mid Back* Standard Base* With 2 Ratcheting Style 15 Inch Arm Rest* Without Suspension...
    50765366
    SKU:
    50765366
    Truck Class:
    Heavy Duty
    Color:
    Tan
    Style Options:
    Mid Back
    Material Options:
    Cloth
    Make:
    Universal Items
    Type Options:
    Standard Base
    Product Type:
    Seats
    $791.99
    Qty in Cart: 0
    Price:
    $791.99
    Subtotal:
  • Rascal Black Vinyl Captain Air Mid Back Seat Standard Base W/ Arm Rest, Air Lumbar Support, Back Cycler, W/O Back Cycler, & Bellows

    Rascal Black Vinyl Captain Air Mid Back Seat Standard Base W/ Arm Rest, Air Lumbar Support, Back Cycler, W/O Back Cycler, & Bellows

    NATIONAL SEATING

    $798.99
    Captain Air Standard Seat Rascal Black Vinyl* High Quality Seat* Captain* Rascal Black* Made Of Vinyl* Mid Back* Standard Base* With 2 Ratcheting Style 15 Inch Arm Rest* Without Suspension Cover-...
    50765305
    SKU:
    50765305
    Truck Class:
    Heavy Duty
    Style Options:
    Mid Back
    Material Options:
    Vinyl
    Make:
    Universal Items
    Type Options:
    Standard Base
    Product Type:
    Seats
    $798.99
    Qty in Cart: 0
    Price:
    $798.99
    Subtotal:
  • Opal Gray Vinyl Captain Mid Back Truck Seat With Armrests, Air Lumbar Support

    Opal Gray Vinyl Captain Mid Back Truck Seat With Armrests, Air Lumbar Support

    NATIONAL SEATING

    $707.99
    Captain Air Standard Seat Opal Gray VinylThis Captain HiPro 95 Air Suspension Truck seat offers drivers comfort and practicality. It features isolating air suspension, a 6" ride zone, and air lumbar...
    50765301
    SKU:
    50765301
    Truck Class:
    Heavy Duty
    Style Options:
    Mid Back
    Material Options:
    Vinyl
    Make:
    Universal Items
    Type Options:
    Standard Base
    Product Type:
    Seats
    $707.99
    Qty in Cart: 0
    Price:
    $707.99
    Subtotal:
  • Rascal Black Vinyl Captain Air Mid Back Seat Standard Base W/ Standard Damper, , Back Cycler, Air Lumbar Support, & W/O Armrests & Back Cycler

    Rascal Black Vinyl Captain Air Mid Back Seat Standard Base W/ Standard Damper, , Back Cycler, Air Lumbar Support, & W/O Armrests & Back Cycler

    NATIONAL SEATING

    $670.99
    Captain Air Standard Seat Rascal Black Vinyl* High Quality Seat* Captain* Rascal Black* Made Of Vinyl* Mid Back* Standard Base* Without Arm Rests* Without Suspension Cover- Bellows* Without Back...
    50765005
    SKU:
    50765005
    Truck Class:
    Heavy Duty
    Style Options:
    Mid Back
    Material Options:
    Vinyl
    Make:
    Universal Items
    Type Options:
    Standard Base
    Product Type:
    Seats
    $670.99
    Qty in Cart: 0
    Price:
    $670.99
    Subtotal:
  • Opal Gray Vinyl Captain Mid Back Truck Seat Standard Base W/ Extendable Cushion

    Opal Gray Vinyl Captain Mid Back Truck Seat Standard Base W/ Extendable Cushion

    NATIONAL SEATING

    $716.99
    Captain Air Standard Seat Opal Gray Vinyl - No Arm RestsThe Captain Truck Seat offers truck drivers a practical and comfortable seating solution. It features isolating air suspension and 6" ride zone...
    50765001
    SKU:
    50765001
    Truck Class:
    Heavy Duty
    Style Options:
    Mid Back
    Material Options:
    Vinyl
    Make:
    Universal Items
    Type Options:
    Standard Base
    Product Type:
    Seats
    $716.99
    Qty in Cart: 0
    Price:
    $716.99
    Subtotal:
  • Black & Black & Silver Gray 2 Tone Leather CT Air High Back Passenger Seat Standard Base W/ Swivel, Bellows, Heat, Wide Back, & Armrests

    Black & Black & Silver Gray 2 Tone Leather CT Air High Back Passenger Seat Standard Base W/ Swivel, Bellows, Heat, Wide Back, & Armrests

    NATIONAL SEATING

    $2,207.99
    2 Tone Leather Admiral CT Air Seat Black & Black & Silver Gray 2 Tone Leather* High Quality Seat* Black And Silver Gray 2 Tone* Leather* With Dual 17 Inch Armrests* Passenger Side Swivel* Standard...
    40179366
    SKU:
    40179366
    Truck Class:
    Heavy Duty
    Color:
    Black
    Style Options:
    High Back
    Material Options:
    Leather
    Make:
    Universal Items
    Type Options:
    Standard Base
    Product Type:
    Seats
    $2,207.99
    Qty in Cart: 0
    Price:
    $2,207.99
    Subtotal:
  • National Admiral High Back Passenger Air Seat Standard Base W/ Swivel, Bellows, Heat, Wide Back, Armrests - Lonestar Black & Black 2 Tone Leather

    National Admiral High Back Passenger Air Seat Standard Base W/ Swivel, Bellows, Heat, Wide Back, Armrests - Lonestar Black & Black 2 Tone Leather

    NATIONAL SEATING

    $1,752.99
    2 Tone Leather Admiral CT Air Seat Lonestar Black & Black* High Quality Seat* Lonestar Black And Black 2 Tone* Leather* With Dual 17 Inch Armrests* Passenger Side Swivel* Standard Features Included...
    40179365
    SKU:
    40179365
    Truck Class:
    Heavy Duty
    Color:
    Black
    Style Options:
    High Back
    Material Options:
    Leather
    Make:
    Universal Items
    Type Options:
    Standard Base
    Product Type:
    Seats
    $1,752.99
    Qty in Cart: 0
    Price:
    $1,752.99
    Subtotal:
  • National Admiral High Back Seat W/ Passenger Side Swivel, Bellows, Heat, Wide Back, Dual Armrests - Black & Silver Leather

    National Admiral High Back Seat W/ Passenger Side Swivel, Bellows, Heat, Wide Back, Dual Armrests - Black & Silver Leather

    NATIONAL SEATING

    $2,487.99
    2 Tone Leather Admiral CT Air Seat Black & Black & Silver Gray 2 Tone Leather* High Quality Seat* Black And Silver Gray 2 Tone* Leather* With Dual 17 Inch Armrests* Passenger Side Swivel* Standard...
    40179356
    SKU:
    40179356
    Truck Class:
    Heavy Duty
    Color:
    Black
    Style Options:
    High Back
    Material Options:
    Leather
    Make:
    Universal Items
    Type Options:
    Standard Base
    Product Type:
    Seats
    $2,487.99
    Qty in Cart: 0
    Price:
    $2,487.99
    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.


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