Rear torque arm hardware kit- We highly recommend purchasing a new hardware kit if running this torque arm on a factory rear-end, Strange or other similar rear-ends that use a straight through long bolt design. Factory torque arm bolts will work however are slightly too short and may not work correctly. For Moser Engineering 12-Bolt rear-end use P/N 2998, the Moser 12-Bolt uses four ½” bolts, P/N 2998 includes longer ½” bolts and spacers to reduce movement. P/N 2998 is for Moser 12-Bolt only, use P/N 3003 on Moser 9”.