This is a long shot, but I have some black Diamond Racing wheels (13x8 with 4" backspace) that I would love to trade for some 15" Miata wheels. Would love to find some 15x8 (or even 15x9 - I can dream, right??). Wheels are in decent shape and performed admirably during the 2011 Challenge. Looks not important, just trying to go up in size.
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