Willpak Industries 10516 Aluminum Car Louver for Chevrolet/Pontiac/TransAm - 3 Piece Fits: 1975-1981 Chevrolet Camaro Z28/Pontiac Firebird/TransAm Coupe Louvers will visually enhance the performance look of your car while increasing privacy and minimizing interior temperature Depending upon the vehicle most of their louvers attach with stainless steel hardware 3M double-sided tapes or dual lock tape or under the trim You can refer to the individual instruction sheets for more information on each louver; rear window louvers were all the rage in the muscle car scene of the 60s, 70s, 80s Installation and attachment is now easier, and less invasive than ever