exhaust tips for 70 Duster

I just bought a set of 2.50 inch exhaust tips for my 69 383-s barracuda that still had the original exhuast tips. The new tips had the hanger a full 3.5 inches farther back than my stock ones. I ended up making some plates that I cut a notch out of and welded (with basically big tacks so I could cut them out easy if I ever wanted to) the original hanger into and drilled two holes into the plate to line up with the original bolt location and an existing hole in the frame. That moved the hanger back where it needed to be so the tips would be in the original location. Otherwise they would stick out 3.5 inches back and look stupid as hell. I called the supplier for the new tips and he hadn't heard about any problems with the tips not being like the originals, as far as the hanger is concerned.
Rod