Use GM metric caliper Ford '74-'80 Pinto spindle Strong and lightweight Safely remove up to 13 lbs. from the front of your car vs. stock rotor 14.8# total rotor weight with 5/8" studs Also drilled for 4-3/4" bolt pattern IMCA, USMTS, UMP, WISSOTA Approved Designed for use with the '74 - '80 Pinto/ Mustang II spindle Use AFCO Brake Bracket 006-40122PL & 006-40122PR