||front. I run the same size wheel (255/35 tire) with no spacer, and it's already very flush, but I suppose 5mm isn't much...
:I run a 18x9.5 +35 with a 5mm spacer on the front with a 275/35/28. At full lock I barely rub the front and rear liners and the knee member. I've got a moderate roll, but nothing crazy.
:This is a little old, running a 265/35/18. Stock fucas on maybe a 1" drop.