Performance Online now offers you the option of upgrading the rear of your classic car to 12″ disc brakes. Available for 1955-57Chevy Belair, 210, 150, Nomadfullsize cars.This kit is for the original GM drop out style rear end. Kits come standard with aluminum PBR style calipers, stainless hoses and drilled, slotted and zinc plated rotors. These kits increase performance and driver feedback.