Whats the recommendation on 330mm rotors for the 116 series?
The Jim K book recommends BMW M3 discs but many of the units I've checked dimensions on are out by a few mm in a few places. Nothing that can't be managed with spacers and other engineering work ... but ...
Are there any bolt on solutions in the 330mm size?
Can't you use the 156 GTA rotors assuming you have the 5 x 98mm bolt pattern?