Buick GS 400 Weatherstrip & Seals - OEM-Fit Door, Trunk & Window Seals

Stop leaks, drafts, and road noise in your Buick GS 400 with precision-fit replacement weatherstrip and seals designed specifically for your vehicle. Each seal is engineered to match the original profile and mounting groove of your Buick GS 400—restoring a tight, quiet seal around your doors, trunk, hatch, and windows.

Our Buick GS 400 weatherstrip is manufactured from durable, weather-resistant rubber compounds such as EPDM, engineered for an exact OEM-quality fit and finish. These materials resist sunlight, ozone, and chemical exposure while maintaining flexibility across temperature extremes, so your new seals stay soft and pliable instead of cracking or hardening the way factory-original rubber does over time.

Use the Vehicle Selector above to find the correct weatherstrip for your Buick GS 400, or browse below to explore available options. Whether you’re chasing down a stubborn water leak or completing a full restoration, Factory Interiors makes it easy to achieve a tight, factory-quality seal with precision-fit weatherstrip for your Buick GS 400.

1968-1969 Buick GS 400 Header Weatherstrip Seal for Convertibles.

For convertible models, this header seal measures 53-3/4" long and is crafted with molded ends and a durable steel core for a precise fit and lasting performance. Designed with high-quality molded sponge material, it ensures a snug seal that effectively protects your vehicle's interior from water penetration, saving you from costly and time-consuming repairs. This part is specifically made for 1968-1972 Buick GS, Skylark, Chevrolet Chevelle, Oldsmobile 442, Cutlass, Cutlass Supreme, Pontiac GTO, LeMans, and Tempest models, offering a perfect fit for these classic cars. The seal is easy to install, fitting securely along the header area to keep your convertible looking and performing its best. Backed by a 30-year warranty from SuperSoft, you can trust in its quality and durability for decades to come.

Features and Benefits
  • Protects your interior from water damage.
  • Made with molded ends and steel core for durability.
  • High-quality sponge material ensures a tight seal.

$120.49
• SALE $96.95
Select Color/Material Options  
1968-1969 Buick GS 400 Header Weatherstrip Seal for Convertibles.
1969 Buick GS 400 Windshield Pillar Post Weatherstrip Seals for Convertibles.

For convertible models, these windshield pillar post seals measure 23-1/2" long and are sold as a pair, offering a precise reproduction of the original sponge material. Designed to fit 1969-1972 Buick GS, Skylark, Oldsmobile 442, Cutlass, Cutlass Supreme, Pontiac GTO, LeMans, and Tempest cars, these seals ensure a snug and secure fit for your classic vehicle. Crafted with a smooth, flawless skin free of exposed cells, they are resistant to sunlight and UV damage, making them durable and long-lasting. These seals are easy to install, fitting seamlessly along the windshield pillar posts to prevent water, wind, and debris from entering the cabin, while maintaining the car's original appearance. Backed by a 30-year warranty from SuperSoft, you can trust in their quality and performance for decades to come.

Features and Benefits
  • Protects against water, wind, and debris.
  • UV and sunlight resistant for long-lasting durability.
  • Smooth, flawless surface for a clean, original look.
  • Easy installation for a secure, factory-like fit.

$120.99
• SALE $96.95
Select Color/Material Options  
1969 Buick GS 400 Windshield Pillar Post Weatherstrip Seals for Convertibles.
1968 Buick GS 400 Windshield Pillar Post Weatherstrip Seals for Convertibles.

For 1968 GM A Body Convertibles, these windshield pillar post seals measure 23-3/16" long and are designed to fit perfectly on both the driver and passenger sides. Crafted from a durable sponge material with a jet-black, smooth skin, these seals are sunlight and UV-resistant, ensuring long-lasting performance and a flawless appearance. The smooth surface is free of exposed cells or flaws, providing a clean and polished look that complements the classic style of your vehicle. These seals are specifically made for 1968 Buick GS 400, Skylark, Chevrolet Chevelle, Oldsmobile 442, Cutlass, and Pontiac GTO, LeMans, and Tempest models, ensuring a precise fit and easy installation. Backed by a 30-year warranty from SuperSoft, you can trust in their quality and durability for decades to come.

Features and Benefits
  • Protects against water and air leaks for a quieter ride.
  • UV-resistant material prevents cracking and fading over time.
  • Smooth, flawless finish enhances the vehicle's appearance.
  • Easy installation ensures a secure and snug fit.

$120.99
• SALE $96.95
Select Color/Material Options  
1968 Buick GS 400 Windshield Pillar Post Weatherstrip Seals for Convertibles.
1968-1969 Buick GS 400 Shift Boot. Each.

Designed for classic Buick cars, this shift boot fits 1965-1972 Buick Gran Sport, GS, GS 350, GS 400, GS 455, and Skylark models. Crafted with precision using over 50 tons of pressure, it ensures perfect definition and detailing for a snug fit and clean appearance. This durable black rubber boot is designed to seal the area around the gear shift, keeping dirt, moisture, and debris out of your vehicle's interior while maintaining a sleek, factory-original look. Its flexible yet sturdy construction makes installation straightforward, providing a secure fit that enhances the overall aesthetic of your car's interior. Backed by Metro's Platinum 30-year warranty, this part offers long-lasting reliability and peace of mind.

Features and Benefits
  • Protects your interior from dirt and moisture.
  • Designed for a precise fit with classic Buick models.
  • Durable rubber construction for long-term use.

$145.49
• SALE $116.95
Select Color/Material Options  
1968-1969 Buick GS 400 Shift Boot. Each.
1968 Buick GS 400 Molded Roof Rail Weatherstrip Seals for 2-Door Hardtop Only. Pair R&L.

Designed specifically for 2-door hardtop models, these molded roof rail seals are crafted to fit perfectly and provide exceptional sealing for your classic car. This pair of left and right seals is engineered to prevent leaks, ensuring your vehicle stays dry and protected from the elements. Made by SUPERsoft, these seals are free from accelerants and cheap fillers, which means they won’t prematurely age or fail like other brands. They are a perfect fit for 1968 Buick GS 350, GS 400, Skylark, 1968 Chevrolet Chevelle, 1968 Oldsmobile 442, Cutlass, F85, and 1968 Pontiac GTO, LeMans, and Tempest models. These seals are easy to install, fitting snugly along the roof rails to restore your car’s original weatherproofing and keep it looking sharp. Backed by SUPERsoft’s 30-year warranty, you can trust these seals to last for decades.

Features and Benefits
  • Provides a watertight seal to prevent leaks.
  • Made with high-quality materials for long-lasting durability.
  • Easy installation ensures a hassle-free upgrade.

$153.49
• SALE $122.95
Select Color/Material Options  
1968 Buick GS 400 Molded Roof Rail Weatherstrip Seals for 2-Door Hardtop Only. Pair R&L.

(45 Total Products)