A 15 x 7 rim should fit fine as long as you maintain the same offset as the factory rims. Your "S" should have 14 x 5.5" rims. I'm not sure what the factory backspace was, but I would guess something like 3.25. An easy way to compare backspace is to take half the difference. 7 minus 5.5 = 1.5 / 2 = .75; 4.125 minus .75 = 3.375. If 3.375 matches the stock backspace, the rims will center the same way in the wheel wells, so if your tire diameter is the same or less than stock, they should fit OK (plenty of width in the back). On a 7" wide rim, a quarter-inch either way is probably close enough. The tight area is at the front lower edge of the front wheel well — when the steering wheel is turned and the suspension is compressed, this is where it will rub. Check the clearance here with your current tire, and extrapolate to a wider tire. Put the jack under the lower arm and raise the wheel up with and turn it all the way left and right and note where it comes closest. Anecdotally, I have heard that a 225/60-15 is right at the edge — might rub and might not. You don't have the stainless wheel well trim so that gives you a little extra room. Like your car, BTW.