This rear window gasket is designed from the original part for superior fitment and seal. The seal mounts around the full perimeter of the back glass and has vulcanized, or bonded, ends which means no cutting or splicing is required for installation. Note: Includes installation instructions. Fitted gasket provides a formed, seamless seal. Designed from original part so it fits correctly. Replaces factory #3778347. We recommend for installation: 3M Brand Cleaner, Bedding Compound, and Clear Sealer.