I'm not sure on the backspacing, but they're on ebay and the guy says he had them on his GS and before that they were on a GN. I just want to make sure they'll fit without rubbing and without having to notch the frame or anything. Also, what size tires would you guys recommend? I'd like to use these for the strip, preferably with drag radials and I believe the general consensus is that MTs are the best. My other concern is that 8.5" is way too wide for the fronts, what do you guys think?