Willpak Industries 10449 ABS Van Rear Window Louver for Chevrolet/GMC Fits: 1971-1996 Chevrolet/GM Full-Size Van These classic, custom-fitted, C-pillar louvers are thermoformed from a durable black ABS material and are easily installed; no drilling required All their products are manufactured to ensure the customer satisfaction of quality products with styling designed for fit and finish, second to none Install simply by placing over the existing glass with the supplied 3M double sided automotive-grade tape; on their own, or matched with their rear window louver (sold separately) Installation and attachment is now easier, and less invasive than ever; non-pop out window (fixed) installs dual lock tape