getting some rust repair done on my valiant and need to find full rear quarter panel RH, are 72-76 dart,scamps and valiants the same? also need to find rear window patch panels the vinyl has done a number back there but after hours of googling these a-bodies get no love.

Yes your Scamp uses the same 1/4's as a Dart. I just installed a set of AMD panels and they were a very good fit with only minor alterations needed

Only difference is the side marker lights holes, might have the ones for your year, back when I did mine and they only had patch panels you could only get the early side marker light panels, then you would have to weld them up then cut them out for 72 and up markers