55-66 Chevy/GMC Rear Window Gasket w/ Black Lockstrip. This rear glass kit is used with 55-66 Chevy/GMC small and large rear window trucks that do not have a factory chrome trim around the glass. Rear glass rubber kit includes the seals and black lockstrip needed to complete the install. Gasket is constructed from ozone resistant EPDM and made to original OE specs. Limited Lifetime Manufacture Warranty.