Right Stuff's rear GM 10 & 12 Bolt disc conversions have what it takes to give your GM some serious stopping power. These kits include 11'' O.D. rotors, new calipers w/ built-in parking brake, parking brake cables (some modification may be required), caliper brackets w/ hardware, brake pads & flex hoses. Each rotor is drilled for GM 5 x 4.75'' w/ 7/16'' stud bolt patterns.