To correct some incorrect information, Boss does make the 338 in a 20x8.5 and a 20x10 in a 5x5 pattern now. The only "factory" solution for the center cap issue is they do offer tri bar "spinner" center cap. I have not been able to verify if the spinner will allow enough clearance. In my case it really doesn't matter as I would not run the spinner even if it did allow the wheel to fit.
