11" AC Delco Style Zinc Single Diaphram Brake Booster for GM Application:1964-1972 Pontiac GTO & Lemans. 1964-1972 Oldsmobile 442 & Cutlass. 1964-1972 Chevy El Camino & Chevelle. 1964-1972 Buick Skylark. 1970-1972 Chevy Monte Carlo. 1969-1974 Chevy Nova. 1967-1969 Chevy Camaro & Pontiac It has a beautiful Zinc finish. This is a single diaphragm booster. This booster will work with drum/drum, drum/disk, and disk/disk brake setups. 11" zinc brake booster. This is an original factory copy done in chrome and looks amazing for your show car or weekend warrior. This will power any type of brake system. Firewall brackets are non removeable, they are rivited on.