Front Dual Piston Wilwood Red Calipers 120-10937 -BK (Wilwood D-52 Brake Pad). Wilwood Front Disc Brake Kit 1964-1972 GM A Body Booster Conversion Kit. Forged billet aluminum bodies, stainless steel pistons, and competition style high-temperature seals put and end to the rust, bore pitting, and seal failures that plague the OE caliper design.