Retrofit Bracket kit (R/H only) for Wilwood’s Pro Street Rear Brake kits. Bracket assembly includes an additional lug mount caliper bracket with 5.25” mount centers for FDL Calipers and mounts for MC-4 parking brake calipers.. Optimized for 12.19” diameter rotors. Engineered from high strength aluminum alloy with 3/8-24 steel clinch nuts.