AMD body panels quality??

They make the fenders up to 71. You can use the 71 fender on a 72 if you patch the side marker light area. No reproduction fenders are available for 73+ dart. Only option is original or fiberglass.
AMD is one of the best for fitment and quality. However any new panel will require some fitting, none are perfect out of the box. Every once in a while you get lucky though.

They do make the quarters but I think they might be on their discontinue list. Its a long list so if you need anything go to their website and check it out. I just got in a pallet load of stuff the other day. I was scared I wouldnt be able to get it later so I bit the bullet and ordered everything I needed for my car in one shot.