5 Lug Double Drilled Porsche/Chevy Pattern Rear Disc Brake Rotor. Fits short spline swing axle. To use with IRS or long spline swing axle a spacer is required (P/N: 22-5281-7). Double Drilled 5 X 130mm Porsche Bolt Pattern (14mm X 1.5 Threads) and 5 X 4-