AFCO Cast Iron Brake Hub & Rotor Flat 1975 - 1981 Ford Style .875 Inches Thick 11 Inches Diameter on 5 x 5 Inch Bolt Pattern - 5/8 Coarse Studs - 9850-6510The Ford rotor is designed to replace any stock Ford rotor. Each rotor has been manufactured using premium grade alloys for superb thermal shock stability, double disked ground to ensure precise flatness, uses high strength 1 2" wheel studs installed on a 5 on 4 1 2" bolt pattern, and has been machined for 4 3 4" pattern as well. For the best stopping power, use AFCO brake pads with this rotor. You will not believe what you have been missing out on!