I just ordered my discs from Topline and asked John I could use aftermarket rotors (such as CSP's) with the kit. He said it would be fine as long as they are the same width as the stock Ghia rotors(which I think they are). He went on to say that the vented rotors would be too thick. As for the 7.5 inch wheels, the test car Topline used with the Maxx Struts has 7.5 inch wheels up front. I guess any questions you have about that can be answered by Topline themselves.