When I installed a set of those really famous Carrara dish and caliper adapters and wanted to keep my Center Line 15" aluminum wheels since they and the Goodyear Cantilever slicks are probably the lightest combo you can ever find. My mentor at Black Forest in San Diego who was also the lead technical race inspector for PCA said that wheel studs had to attach to the hub which is, of course, fastened to the spindle with that big ass nut. Porsche Cars America sold longer studs which were VERY EXPENSIVE! I have attached 2 pictures with just the hub and with spacers. Since you said you plan to race the car some, I would strongly suggest contacting the organizations to see if the rules have changed any since my young and wilder days?
John
