1973 GMC K35/K3500 Pickup Carpet & Floor Mat Replacement – Buyer's Guide
June 29, 2025
The 1973 GMC K35/K3500, part of GM’s “Squarebody” generation, was a heavy-duty workhorse favored for its rugged durability and utilitarian style. With 4WD capabilities and a Crew Cab configuration, it earned a reputation among truck enthusiasts and restoration hobbyists as one of the most iconic pickups of the era. Today, many restorers seek to preserve or upgrade these trucks—especially the interior, which often shows signs of wear from decades of use.
Why Replace the Carpet in a Squarebody GMC?
After 50 years, original carpet in a 1973 GMC K35/K3500 often suffers from stains, cracking, fading, or water damage. Common complaints include old insulation that holds moisture, worn-through heel areas, and deteriorated jute padding. Replacing the carpet and mats is one of the best ways to refresh the cabin, reduce odors, and restore the classic appearance. Whether you're going for a factory-style restoration or a custom build, Factory Interiors has you covered with premium options built for precise fitment and durability.
Material Options for the 1973 GMC K35/K3500
All carpet kits for this truck are made in period-correct loop material, which is true to how GM originally outfitted these vehicles. However, some customers opt for cutpile or Essex upgrades for a more modern look or smoother texture—especially in retro-rod applications. Essex is a premium, denser form of cutpile that offers a luxurious feel but is not era-correct for concours restorations.
Construction: Molded vs. Die Cut
The main replacement carpet for the K35/K3500 is a molded kit, designed using a vacuum-formed process to replicate every contour of the factory floor pan. This results in a more precise fit and easier installation compared to universal or flat-lay kits. Matching loop die-cut panels are also available for the door panels and rear cab wall inserts.
Padding & Heat Control
All molded carpet kits listed below come with jute padding already attached underneath for sound and thermal insulation. If you’re restoring a truck with a loud drivetrain, high idle, or road vibrations, we recommend upgrading to mass backing. This adds a heavy rubber layer beneath the carpet to block noise and heat and can dramatically improve comfort—especially if your K35 sees regular highway use or is driven in warmer climates.
Installation Tips for the 1973 K-Series GMC
- Test fit first—lay the carpet in place before trimming or cutting any holes.
- Use a reverse drill bit to carefully open holes for seat bolts and shifters.
- Label your trim hardware during removal so it’s easy to reassemble.
- Warm up the carpet in the sun to help it relax and conform to the floor pan.
- Check for rust or insulation rot underneath—many trucks hide moisture under old jute padding.
DIY install is totally doable for enthusiasts with patience and basic tools, but professional shops can help if you’re building a show truck or doing a full cab-off restoration.
Product Comparison Table
| Product | Material | Construction | Placement | Jute Padding | Image |
|---|---|---|---|---|---|
| Floor Mats – 4pc – Loop | Loop | Die Cut | Front & Rear (Crew Cab) | N/A |  |
| Carpet – Complete – Loop | Loop | Molded | Complete Crew Cab Floor | Attached |  |
| Door Panel Inserts | Loop | Die Cut | Doors (Crew Cab) | N/A |  |
| Rear Cab Wall | Loop | Molded | Rear Wall (Reg Cab) | N/A |  |
Additional Options
- Need a loose heel pad or export option for right-hand drive? Contact us when ordering to make special requests.
- Need extra carpet for your console, cab corners, or custom panels? Order additional yardage here.
- Not sure on color? Request a free sample to take the guesswork out of your restoration.
Why Choose Factory Interiors?
All of our products are proudly Made in the USA by Auto Custom Carpets (ACC), the #1 manufacturer of replacement automotive carpet for over 45 years. As a leading distributor, Factory Interiors offers knowledgeable support, competitive pricing, and the widest selection of ACC products online. Whether you’re restoring a vintage Squarebody or just tired of looking at worn-out flooring, we have the best-matching products to complete your project with confidence.