Ayone running 17x7 ET mags LT-III?

So if you have 4-7/8 backspace on a 8in rim that would make the "front space" 4-1/8 as the overall width is 9in.
So for the 7in rim whith 4-1/4" back space the "front space" would be 3-3/4in so actually sticking out 3/8in less than the 17x8 devil chicken are running so then the question is, it there a difference in fender clearance between the 71 Dart Swinger and the 71 Scamp?