[M Fifty]

Well... I'm currently running 8.5/19 et20 with 255/35 Cup2 on the front. The outer edges rub the arch liner at 3/4 turn of lock. But, I'm running MPS at 595mm ride height.

Edit: Fitted MPSS 245/35 to the wheels above and the clear the arch liners - just.

So, on narrower wheels at ET20, the stock tire sizes just clear the arch liners at a ride height of 595mm. At ET19 (which you would get with 763M running 10mm spacers) and lowered, you might have problems.

HTH