Any offset between ET20 and ET24 will work fine with an 8" wide wheel. You can actually buy 8 X 16 with ET24 eight holes wheels for your car. So unless you are dead set on the SL wheels you may be better off buying the correct wheels to begin of. By the way the 225/60 is too tall, try 225/55, 235/50, 225/50 or 245/45-16. Good luck.