Here's a more Crossfire specific installation of H&R 10mm F and 12mm R wheel spacers

1. Before installing spacers, remove all corrosion on the axle-stub and contact surface.
2 Check that the spacer fits flush against the wheel hub.
3. Replace STOCK bolts with longer H&R wheel bolts.
4. Its easier to mount the wheel spacer first on the wheel / rim hub and push it in until it fits flush to the hub. ( Photo no. 2 )
5. Install the wheel and torque the bolts at 81 ft. lbs.