Ok, looking at adding spacers to the back wheels. The inner lip of the guard has already been rolled (from factory). Ive got 18 inch wheels which are ET30. Looking at using 15mm spacers. I've measured the gap between the tyre and guard and it is exactly 15mm. Does this mean I need to flare a little bit of the rear guards? The car has been lowered on eibachs and #3pads