difference between inner and outer rear wheel wells?

My son and I just mini-tubbed his 69 Dart.. All we did was move the inner fender well over to the frame, then filled the 2 1/2 inch gap, with a strip of old hood material.

I think there's a thread here, perhaps some-one has the link...

If not, my son has pics on his phone,, I could post tommorrow..

It's pretty easy, just spend some time looking at it, think of removing the 6 or so spot welds on the hinge support, you'll see how to shorten the support, then split the wheel well, cutting along one of the inner-most "lines" they conveniently supply (the "lines" are easiest to see from underneath). Cut alongside frame, trim off a coupla inches of tin, weld the inner wheel well to frame,, fill the gap with tin strip.. I sure hope that makes some sense,, I hope there's a link ?