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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
  • Knoedler 1 Inch Low Base Adapter 1.250 Inches Shorter Than Standard Base

    Knoedler 1 Inch Low Base Adapter 1.250 Inches Shorter Than Standard Base

    KNOEDLER

    $74.99
    1 Inch Low Base AdapterEnhance your truck driving experience with the Knoedler 1 Inch Low Base Adapter. Crafted for low-riding Knoedler seats, it lowers the seat by 1.250 inches to improve ergonomics...
    09-192065
    SKU:
    09-192065
    Product Type:
    Seats
    Make:
    Universal Items
    $74.99
    Qty in Cart: 0
    Price:
    $74.99
    Subtotal:
  • 12 Inch Seat Base Adapter By Vendetta For Peterbilt 589

    12 Inch Seat Base Adapter By Vendetta For Peterbilt 589

    VENDETTA

    $301.99 - $420.99
    Choose Option(s) to see description.Fitment* Fits Peterbilt 589 2024 thru CurrentVendetta 12 Inch Aluminum Seat Base Adapter For Peterbilt 58912 Inch Aluminum Seat Base Adapter By Vendetta* High...
    PPR_299528
    SKU:
    PPR_299528
    Material Options:
    Billet Aluminum
    Color:
    Black
    Location:
    Made In USA
    Product Type:
    Seats
    Length Options:
    12 Inch
    Make:
    Peterbilt
    Width Options:
    12 Inch
    Style Options:
    Vendetta
    Ready To Ship:
    Yes
    $301.99 - $420.99
    Qty in Cart: 0
    Price:
    $301.99 - $420.99
    Subtotal:
  • Black Full Leather Air Ride Seat W/ Air Vent Cooling & Heat, Dual Lumbar Support & Dual Arm Rests By Prime Seating

    Black Full Leather Air Ride Seat W/ Air Vent Cooling & Heat, Dual Lumbar Support & Dual Arm Rests By Prime Seating

    PRIME SEATING

    $1,459.99
    Prime Seating Black Full Leather Air Ride Seat W/ Air Vent Cooling & Heat, Dual Lumbar Support & Dual Arm RestsExperience next-level comfort with the Prime Seating Black Full Leather Air Ride Seat,...
    TC600LBKBIS
    SKU:
    TC600LBKBIS
    Height Options:
    48 Inch
    Length Options:
    26 Inch
    Type Options:
    Heated
    Color:
    Black
    Width Options:
    26 Inch
    Material Options:
    Leather
    Product Type:
    Seats
    Make:
    Universal Items
    $1,459.99
    Qty in Cart: 0
    Price:
    $1,459.99
    Subtotal:
  • Knoedler Adapter Plate For Air Chief Seats For Ford

    Knoedler Adapter Plate For Air Chief Seats For Ford

    KNOEDLER

    $252.99
    Adapter Plate For Air Chief Seats Fits Ford ModelsUpgrade your Ford truck seating system with the Knoedler Adapter Plate for Air Chief Seats. This high-quality adapter plate ensures a secure and...
    RR10FORD000
    SKU:
    RR10FORD000
    Product Type:
    Seats
    Make:
    Ford
    $252.99
    Qty in Cart: 0
    Price:
    $252.99
    Subtotal:
  • Knoedler Adapter Plate For Air Chief Seats For International

    Knoedler Adapter Plate For Air Chief Seats For International

    KNOEDLER

    $72.99
    Adapter Plate For Air Chief Seats Fits International ModelsReinforce the mounting of your Knoedler Air Chief Seats with the Knoedler Adapter Plate for International trucks. Crafted from high-quality...
    RR07INTER000
    SKU:
    RR07INTER000
    Product Type:
    Seats
    Make:
    International
    $72.99
    Qty in Cart: 0
    Price:
    $72.99
    Subtotal:
  • Knoedler Adapter Plate For Air Chief Seats For Kenworth & Peterbilt

    Knoedler Adapter Plate For Air Chief Seats For Kenworth & Peterbilt

    KNOEDLER

    $86.99
    Adapter Plate For Air Chief Seats Fits Kenworth & Peterbilt ModelsEnsure your Kenworth or Peterbilt Air Chief Seats are mounted securely with the Knoedler Adapter Plate, engineered for precision and...
    RR15KWPB000
    SKU:
    RR15KWPB000
    Product Type:
    Seats
    Make:
    Kenworth
    Make:
    Peterbilt
    $86.99
    Qty in Cart: 0
    Price:
    $86.99
    Subtotal:
  • Billet Aluminum Seat Base Adapter Mounting Plate- For Sears/Atlas Premium Elite 80 Seat With Low Profile Suspension Base

    Billet Aluminum Seat Base Adapter Mounting Plate- For Sears/Atlas Premium Elite 80 Seat With Low Profile Suspension Base

    ROCKWOOD

    $221.99
    Billet Aluminum Seat Base Adapter Mounting PlateImprove driver comfort and stability with the Billet Aluminum Seat Base Adapter Mounting Plate, compatible with Sears/Atlas Premium Elite 80 Seats and...
    USB597
    SKU:
    USB597
    Material Options:
    Billet Aluminum
    Product Type:
    Seats
    Make:
    Universal Items
    $221.99
    Qty in Cart: 0
    Price:
    $221.99
    Subtotal:
  • Knoedler Extreme Low Rider Mid Back Seat W/ Headrest, Arms, Isolator- Gray Mordura Cloth

    Knoedler Extreme Low Rider Mid Back Seat W/ Headrest, Arms, Isolator- Gray Mordura Cloth

    KNOEDLER

    $2,249.99
    Gray Mordura Cloth Extreme Low Rider Mid Back Seat W/ Headrest, Arms, IsolatorOptimize your truck cab with the Knoedler Extreme Low Rider Mid Back Seat, upholstered in durable gray Mordura cloth and...
    98SCL62MH0D05
    SKU:
    98SCL62MH0D05
    Material Options:
    Nylon
    Product Type:
    Seats
    Degree Options:
    45
    Color:
    Gray
    Style Options:
    Mid Back
    Make:
    Universal Items
    $2,249.99
    Qty in Cart: 0
    Price:
    $2,249.99
    Subtotal:
  • Knoedler Low Rider Air Chief High Back Seat W/ FAS Lumbar, Arms W/ Black Synthetic Leather

    Knoedler Low Rider Air Chief High Back Seat W/ FAS Lumbar, Arms W/ Black Synthetic Leather

    KNOEDLER

    $1,580.99
    Black Synthetic Leather Low Rider Air Chief High Back Seat W/ FAS Lumbar, ArmsTake your driving comfort to the next level with the Knoedler Low Rider Air Chief High Back Seat. Lowered by 1.5 inches,...
    98LRL82TB0S01
    SKU:
    98LRL82TB0S01
    Degree Options:
    45
    Width Options:
    20 Inch
    Color:
    Black
    Material Options:
    Synthetic Leather
    Style Options:
    High Back
    Product Type:
    Seats
    Make:
    Universal Items
    $1,580.99
    Qty in Cart: 0
    Price:
    $1,580.99
    Subtotal:
  • Knoedler Extreme Low Rider Air Chief Mid Back Seat W/ FAS Lumbar, Headrest, Arms, Integrated Compressor- Black & Gray Synthetic Leather

    Knoedler Extreme Low Rider Air Chief Mid Back Seat W/ FAS Lumbar, Headrest, Arms, Integrated Compressor- Black & Gray Synthetic Leather

    KNOEDLER

    $2,625.99
    Black & Gray Synthetic Leather Extreme Low Rider Air Chief Mid Back Seat W/ FAS Lumbar, Headrest, Arms, Integrated Compressor- Black & Gray Synthetic LeatherFor drivers seeking a perfect blend of...
    98SSL62MH0S015
    SKU:
    98SSL62MH0S015
    Product Type:
    Seats
    Color:
    Black
    Material Options:
    Synthetic Leather
    Style Options:
    Mid Back
    Degree Options:
    45
    Make:
    Universal Items
    $2,625.99
    Qty in Cart: 0
    Price:
    $2,625.99
    Subtotal:
  • Knoedler Extreme Low Rider Air Chief Mid Back Seat W/ FAS Lumbar, Arms, Headrest, Integrated Compressor- Black Synthetic Leather

    Knoedler Extreme Low Rider Air Chief Mid Back Seat W/ FAS Lumbar, Arms, Headrest, Integrated Compressor- Black Synthetic Leather

    KNOEDLER

    $2,625.99
    Black Synthetic Leather Extreme Low Rider Air Chief Mid Back Seat W/ FAS Lumbar, Arms, Headrest, Integrated CompressorMaximize long-haul comfort with the Knoedler Extreme Low Rider Air Chief Mid Back...
    98SSL62MH0S01
    SKU:
    98SSL62MH0S01
    Color:
    Black
    Style Options:
    Mid Back
    Degree Options:
    45
    Product Type:
    Seats
    Material Options:
    Synthetic Leather
    Make:
    Universal Items
    $2,625.99
    Qty in Cart: 0
    Price:
    $2,625.99
    Subtotal:
  • Knoedler Extreme Low Rider Air Chief Mid Back Seat W/ FAS Lumbar, Arms, Headrest- Gray Synthetic Leather

    Knoedler Extreme Low Rider Air Chief Mid Back Seat W/ FAS Lumbar, Arms, Headrest- Gray Synthetic Leather

    KNOEDLER

    $2,267.99
    Gray Synthetic Leather Extreme Low Rider Air Chief Mid Back Seat W/ FAS Lumbar, Arms, HeadrestElevate your driving experience with the Knoedler Extreme Low Rider Air Chief Mid Back Seat, upholstered...
    98SCL62MH0S05
    SKU:
    98SCL62MH0S05
    Degree Options:
    45
    Color:
    Gray
    Material Options:
    Synthetic Leather
    Style Options:
    Mid Back
    Product Type:
    Seats
    Make:
    Universal Items
    $2,267.99
    Qty in Cart: 0
    Price:
    $2,267.99
    Subtotal:
  • Knoedler Extreme Low Rider Mid Back Seat W/ Headrest, Arms, Isolator- Black Mordura Cloth

    Knoedler Extreme Low Rider Mid Back Seat W/ Headrest, Arms, Isolator- Black Mordura Cloth

    KNOEDLER

    $2,249.99
    Black Mordura Cloth Extreme Low Rider Mid Back Seat W/ Headrest, Arms, IsolatorTake command of your cab with the Knoedler Extreme Low Rider Mid Back Seat, designed for maximum comfort and...
    98SCL62MH0D01
    SKU:
    98SCL62MH0D01
    Product Type:
    Seats
    Color:
    Black
    Material Options:
    Nylon
    Style Options:
    Mid Back
    Degree Options:
    45
    Make:
    Universal Items
    $2,249.99
    Qty in Cart: 0
    Price:
    $2,249.99
    Subtotal:
  • Knoedler Extreme Low Rider Mid Back Seat W/ FAS Lumbar, Arms- Black Synthetic Leather

    Knoedler Extreme Low Rider Mid Back Seat W/ FAS Lumbar, Arms- Black Synthetic Leather

    KNOEDLER

    $2,170.99
    Black Synthetic Leather Extreme Low Rider Mid Back Seat W/ FAS Lumbar, ArmsRide in comfort and style with the Knoedler Extreme Low Rider Mid Back Seat, a high-performance seat designed for drivers...
    98SCL60MB0S01
    SKU:
    98SCL60MB0S01
    Degree Options:
    45
    Width Options:
    20 Inch
    Material Options:
    Synthetic Leather
    Color:
    Black
    Style Options:
    Mid Back
    Product Type:
    Seats
    Make:
    Universal Items
    $2,170.99
    Qty in Cart: 0
    Price:
    $2,170.99
    Subtotal:
  • Knoedler Low Rider Air Chief Wide Seat W/ FAS Lumbar, Arms- Black Synthetic Leather

    Knoedler Low Rider Air Chief Wide Seat W/ FAS Lumbar, Arms- Black Synthetic Leather

    KNOEDLER

    $1,580.99
    Black Synthetic Leather Low Rider Air Chief Wide Seat W/ FAS Lumbar, ArmsDrive in comfort and style with the Knoedler Low Rider Air Chief Wide Seat. The 23-inch wide cushion, mid-back seat, and...
    98LWL82MH0S01
    SKU:
    98LWL82MH0S01
    Product Type:
    Seats
    Color:
    Black
    Style Options:
    Mid Back
    Material Options:
    Synthetic Leather
    Width Options:
    23 Inch
    Degree Options:
    45
    Make:
    Universal Items
    $1,580.99
    Qty in Cart: 0
    Price:
    $1,580.99
    Subtotal:
  • Knoedler Air Chief Standard Base Mid Back Seat W/ FAS Lumbar, Arms, Headrest, Bellows- Black & Brown Synthetic Leather

    Knoedler Air Chief Standard Base Mid Back Seat W/ FAS Lumbar, Arms, Headrest, Bellows- Black & Brown Synthetic Leather

    KNOEDLER

    $1,876.99
    Black & Brown Synthetic Leather Air Chief Standard Base Mid Back Seat W/ FAS Lumbar, Arms, Headrest, BellowsLong-haul drivers can enjoy unmatched comfort with the Knoedler Air Chief Standard Base Mid...
    98CWL82MH0S12
    SKU:
    98CWL82MH0S12
    Product Type:
    Seats
    Style Options:
    Mid Back
    Material Options:
    Synthetic Leather
    Color:
    Black
    Width Options:
    23 Inch
    Make:
    Universal Items
    $1,876.99
    Qty in Cart: 0
    Price:
    $1,876.99
    Subtotal:
  • Knoedler Chief Standard Base High Back Seat W/ 2 Lumbar Supports, Arms, Heat, Massage- Red & Black Synthetic Leather

    Knoedler Chief Standard Base High Back Seat W/ 2 Lumbar Supports, Arms, Heat, Massage- Red & Black Synthetic Leather

    KNOEDLER

    $2,996.99
    Red & Black Synthetic Leather Chief Standard Base High Back Seat W/ 2 Lumbar Supports, Arms, Heat, MassageElevate your cab interior with the Knoedler Chief Standard Base High Back Seat, designed for...
    98CHS82TB0S16
    SKU:
    98CHS82TB0S16
    Color:
    Black
    Product Type:
    Seats
    Degree Options:
    45
    Style Options:
    High Back
    Material Options:
    Synthetic Leather
    Height Options:
    20 Inch
    Make:
    Universal Items
    $2,996.99
    Qty in Cart: 0
    Price:
    $2,996.99
    Subtotal:
  • Knoedler Chief Standard Base High Back Seat W/ FAS Lumbar, Arms, Heat, Massage- Black

    Knoedler Chief Standard Base High Back Seat W/ FAS Lumbar, Arms, Heat, Massage- Black

    KNOEDLER

    $2,205.99
    Black Chief Standard Base High Back Seat W/ FAS Lumbar, Arms, Heat, MassageDrive longer and more comfortably with the Knoedler Chief Standard Base High Back Seat. This Air Chief-style seat features a...
    98CHL82TBHS01
    SKU:
    98CHL82TBHS01
    Height Options:
    20 Inch
    Degree Options:
    45
    Material Options:
    Synthetic Leather
    Style Options:
    High Back
    Color:
    Black
    Product Type:
    Seats
    Make:
    Volvo
    $2,205.99
    Qty in Cart: 0
    Price:
    $2,205.99
    Subtotal:
  • On Sale
    Limited Quantity Available
    Knoedler Harrier Standard Base High Back Seat W/ Air Lumbar, Arms- Black Synthetic Leather

    Knoedler Harrier Standard Base High Back Seat W/ Air Lumbar, Arms- Black Synthetic Leather

    KNOEDLER

    Now: $933.79
    Was: $1,333.99
    Black Synthetic Leather Harrier Standard Base High Back Seat W/ Air Lumbar, ArmsExperience premium comfort and advanced ergonomics with the Knoedler Harrier Standard Base High Back Seat. This...
    941082TB0S01
    SKU:
    941082TB0S01
    Material Options:
    Synthetic Leather
    Degree Options:
    45
    Product Type:
    Seats
    Color:
    Black
    Style Options:
    High Back
    Make:
    Universal Items
    Ready To Ship:
    Yes
    Now: $933.79
    Was: $1,333.99
    Qty in Cart: 0
    Price:
    Now: $933.79
    Was: $1,333.99
    Subtotal:
  • FREE SHIPPING
    Legacy Seat Base Adapter Mounting Plate

    Legacy Seat Base Adapter Mounting Plate

    ROCKWOOD

    $378.99
    Polished Aluminum Seat Base Adapter Mounting PlateNeed more leg room when driving? 4 State Trucks offers this quality seat base adapter by Rockwood. It provides up to 4 inches of additional leg room...
    USB626
    SKU:
    USB626
    Material Options:
    Billet Aluminum
    Product Type:
    Seats
    Truck Class:
    Universal
    Make:
    Universal Items
    Ready To Ship:
    Yes
    $378.99
    Qty in Cart: 0
    Price:
    $378.99
    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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