C3 1978-1982 Corvette Seat Foam - Bottom 4-Inch

Restore the aggressive seating posture and eliminate sagging in your late-model C3 Corvette with this 4-inch bolster seat bottom foam. Designed specifically for 1978–1982 Chevrolet Corvette models, this reproduction cushion returns the factory-correct dimensions and lateral support that standard replacements lack.

This seat cushion incorporates a 4-inch bolster design to replicate the original high-side support found in performance-oriented C3 interiors. The increased bolster height matches the contours of rear wheel wells, providing enhanced lateral hold and ensuring the seat back maintains its intended angle.

Molded from automotive-grade foam, this bottom cushion is engineered to retain firmness and resist long-term compression. It replaces weakened or collapsed core foam, creating a level surface that prevents upholstery shifting and guarantees correct alignment with door handles, console trim, and side bolsters.

Upholstery integrity depends on the condition of the underlying foam structure. Replacing this cushion is essential when installing new seat covers, as old, uneven foam causes bulging and improper fitment on newer fabrics and leathers. This foam substrate ensures that seat covers drape correctly and secure firmly over the seat frame.

• Fits 1978, 1979, 1980, 1981, and 1982 Chevrolet Corvette models
• Coupe and Convertible body styles
• Suitable for seats with 4-inch bolster cushion configurations

This product fits C3 Corvette Coupe and Convertible models equipped with the 4-inch bolster seat cushion configuration. Verify your seat setup prior to installation to ensure proper match.