Repl. Rear Brake Rotor, 5/130 Porsche & 5 / 4.75" Chevy Short Spline, Each Kits 22-2910, 22-2911, 22-2912, 22-2913, 22-2914 Works for both Swing axle and I.R.S. (I.R.S. requires P/N: 22-5281-7 Spacer) Double drilled for use with either Porsche 5x130 bolt pattern using M14-1.5 threads or Chevy 5x4.75 bolt pattern using 12mm theads. Must purchase studs separately.