The rims are 18x10's, that's the smallest recommended width for 295/35/18's.
The quarter lip I cut back all the way to the spot welds between the quarter and the outer wheel tub. Spot weld placement wasn't exactly perfect from the factory, it amounted to about about a 1/2" of sheet metal I cut back, maybe a little less. You can see the difference from stock in this picture. At this point the issue at my ride height is the "bump" in the outer wheel tub, the lip clears no problem.