'75 rear bumperettes -what fits?

* The style (fat/skinny) are the same front & back based on year. Pretty sure they went to all skinny in 1975.
* The fronts and rears definitely don't interchange because the bumper contours are different.
* I pretty sure Dart/Duster front guards don't interchange because of bumper contours.
* Swinger & Scamp rears may have different contours from Sports & Dusters. I don't have any Swinger or Scamp rear bumpers to confirm.
* 1974 was a transition year from standard bumper brackets to the "shock absorber" brackets. Bumper guard style remained the same (fat). But I do recall some bumper guards being all rubber and some being 1/2 rubber & 1/2 chrome.

If interested, I have pics to email if you want to PM your email address. Chrome is pretty good, rubber has some creases/dings, inside has surface rust, some chrome flaking & some scaling, but very solid and studs are intact.