FWIW, to clear the large calipers of the 600SL/SL600, it's not just offset & diameter, but the wheel's hub-pad length as well.

Unfortunately, wheel hub-pad length is more dependent on the wheel's design, rather then it's diameter or offset.

:-) neil
1988 360TE AMG w/500E brakes
finding 17x7.5 wheels with enough back-pad length to clear 500E calipers was a pain. Went with factory Mercedes wheels.