For use with OEM 1973 - 1999 99 single rear wheel GM 14-Bolt. Includes 0.463" thick 7075 aluminum caliper mounting brackets, aluminum brake hats that are drilled to accept 5/8" drive studs in a 6-1/2" x 8-bolt., solid steel rotors with cleaning grooves, slot-drive rotor attachment system, all required mounting hardware, and MW 4 piston calipers with linings. Installation - Service instructions can be found on Service Bulletin #0109.