Replacement brake rotor for your 1969-1972 GM midsize car. These rotors are specifically designed for the rigors of dirt track racing. Following applications:Caprice, Chevelle, Monte Carlo, Nova, 442, Cutlass, Grand Prix, GTO, LeMans, VenturaDrilled with a 5-on-4.75″ bolt circle. Includes 7/16″ fine quick-start wheel studs (installed).1969-1972 GM midsize11 Inch Brake Rotor5 on 4-3/4 Inch7/16″ fine studs installed11″ diameter x 1″IMCA ApprovedWheel stud info:.564″ knurl.375″ shoulder7/16″-20 threads1-5/16″ long