i got 20's on my 04 is200 and its lowered 3 1/2 inches from standard and they dont touch my car at all, the car came like this but the guy i brought it off said he had the wheels imported from japan and they custom offset the wheels for him to fit the car to avoid any troubles, probs cost a bit more but depens on if u want it done correct on not.
i cant give anymore info on where he got them i wouldnt know but its an option :)