Front Dual Piston Wilwood Red Calipers 120-10937 -BK (Wilwood D-52 Brake Pad). Wilwood Front & Rear Disc Brake Kit 1964-1967 GM A Body Booster Conversion Kit big block engines only. Rear GM Powder coated Red E-Brake calipers large bore single piston (not Wilwood) Designed by GM.