A: Disc Brake REAR Kit: 64-72 (Nova, Camaro Firebird)For the GM 10 or 12 bolt REAR .. staggered or NON Staggered .. you choose.. CHOOSE Staggered Caliper fitment., LHS is forward.. RHS is rear of the diff. Non staggered.. both calipers are on the forward side of the diff. You need 15" rims minimum A kit that allows you to convert from Rear drum to Rear disc in a factory engineered way. for 68 69 Camaro Firebird, 68 72 Nova X body For non staggered shock cars (shocks are located on the rear of the axle