I have two questions re replacement parts and judging on mid '70's BMW Airhead machines. The first has to do with gas tanks on R90S models. These machines had pop-up gas caps, but the tooling was changed when the 1000cc models came out in 1977. One could still purchase a factory painted tank for a '75 R90S, but it came with the flush mounted gas cap of the '77 and later models. Would such a tank result in a loss of points? Second question--on R100RS models with cast wheels, there was a factory recall to replace the front wheel. The configuration of the front wheel casting differed somewhat from that of the original wheel. Would a machine with the replacement wheel lose points?