I've used these on Rebel S Racing 935 Spring Plates and Rebel's greaseless rear spring plate bushings. I've just had a small run made (6 sets) and have 2 sets left. They are aluminum and will need to be welded on and slightly clearanced at the front inside edge, When the car is on the lift there are no worries about damaging the seam on the pan or having to use the rear sway bar mount.
$150.00 plus shipping and Paypal.
