Was thinking of 18s.Top pic 'Swiss Z3' - 'Style 42' BBS RS 723 17x7.5 ET41 & RS724 17x8.5 ET41.
I will be using the 8.5 as a front wheel with the 17x9j on the rear. Even with a 9j, it's not relatively wide. There's space for more with the right offsets or mods.
You thinking 17s?
Still open to 17s, the standard wheels are 17, but most dished DTM wheels (my preference) I can see for sale are 18.
Looking at the arches, seems 9J will fit without changing ET, if I go for 9.5J what's the best offset 34-37?