This disc brake conversion kitiseverything you need at the wheel to convert to disc brakes on your 1963-65 Buick Riviera. A true bolt-on kit using the factory mounting holeson the spindle. Precision laser cut .375″ thick caliper brackets allows for a perfect caliper fit.These kits mount to your original spindle making installation a snap and include 5 x 5″ bolt pattern rotors. For ultimate performance combine with our power brake booster.