GM 10 & 12 Bolt Rear Disc Brake Conversion Kit for 1964-1972 [Premium Kit with E-Brake & Red Calipers]1964 1972 GM A Body Premium Kit Includes: 11 in. Cross Drilled Slotted Rotors w 5 x 4. 750 in. & 5 x 4. 500 in. Dual Bolt Patterns Red Calipers w built in E Brake See Special Note Below Standard Shock Configuration GM 10 & 12 Bolt Rear Axle Disc Brake Conversion Kit with cross drilled and slotted rotors and e brake is an easy bolt on solution for upgrading your GM rear end to disc brake performance. This kit is designed for GM rear axles with coil