On my 2018 M6 GC both 275 front and 305 rear rub on stock 343M when lowered with a 10MM spacer. I have the Dinan coilovers set about .7" lower. The issue is the 9.5 / 10.5 widths bulge a little bit and the sidewalls are vertical. Wider wheels fix it as the tire leans over a little. I had to take my spacers out on the stock wheels to get rid of the bulk of the rubs. I was rubbing on the plastic liner and felt wheel well liner, not the fender. You could possibly heat and push and or trim those to be rub-less. I still rub in one small spot on the front without the spacer. YMMV.
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