www.tires.com a.k.a.
www.discounttiredirect.com(discount tire direct) sells anodized aluminum hib centric rings in all different sizes for $15 shipped. Tell them the ID of the wheel and the OD of the hub and they'll sell/send you some nice, hard (pink color) anodized rings. If you don't have access to a digital or analog set of calipers, just tell them the donor car from which the wheels come (RX8) and that you're mounting them on an SVX and they'll look up the specs for both. I have run them on all my non stock wheels on all different types of vehicles for the last decade.