I can't give the definitive answer here, but can give a couple of hints that might help you.

I have 330's with Brembo 4-Pots behind 16" wheels, so 330's behind 17's is a breeze. I don't think the 6-pots are really that much bigger in size.

Gary has 360mm AP's with their 6-pots, behind 18's and that is a fairly comfortable fit.

IMO, 343mm would be fine, even 356mm, but can't say for sure.

Hope this was some help!!

Even if only to prompt some more replies.