1973-1977 GM rotor Bolt Pattern 5 x 4-3/4"  conversion rotor. Has 7/16" fine wheel studs.

11 Inch Rotor 
GM Bolt Pattern 
5 x 4-3/4"
7/16-20 Fine Threads Studs 
1 Pair of rotors

1973-1977 GM Midsize cars