When we were at Gray Rock Jeff asked me where I got my wheels from and I couldnt remember at the time but now I have. I ordered them from Frankie's Offroad in Alabama. IE Frankie Fountain the man who built Dan Dibbles buggy. The website isnt much to look at but he can build you whatever wheels you want and the prices are reasonable.
http://www.geocities.com/comcastsports/FrankiesOffroad.html
http://www.geocities.com/comcastsports/FrankiesOffroad.html