The Pro+ system comes with the 2-piece 6-piston, 6P caliper mounted to a 14", 2 piece slot, drill, zinc plated rotor. The 6P caliper has D.O.T compliant dust and weather seals and uses the popular D0731 pad type. Rotors are pre-assembled with NAS high grade stainless hardware and all mounting brackets, stainless braided hoses and hardware are also included. The 14" Pro+ is designed to fit most 18” or larger wheels. Fits 1960-87 Chevy/GMC 2WD 1/2 Ton Trucks w/Wilwood C10 Aluminum Modular Pro Spindles (Also fits CPP X10 Spindles)