Thanks for the info NorCal. I did not know the OR wheels were 5.375 backspacing, so basically, the AR wheels would only be 1/4" farther out per side (due to wheel width delta)....shouldn't be a problem.
It's not per side, because backspacing, (b.s.), is the distance from the mounting surface to the outermost edge of the rim's inside, (in other words, if you laid the rim on the driveway, good side up, and measured from the driveway to the mounting surface). So all additional width goes to the outside, when the b.s. is the same.
Since the b.s. is 5.375" for both, and the Off Road rim, (and XE rim), is nominally 7.5" and the AR is 8.5", the AR will stick out 1" more. If comparing to the stock SE or LE rims, ('04-'07 models, don't know about any of the '08), since they have 5.5" b.s., a 8.5" with 5.375" b.s. will stick out 0.625" more, (because they are half an inch wider than the Off Road rim, and have 0.125" more b.s.).
But still shouldn't be a problem with your setup.