Bucket Seat assembly help needed

I presume these are 1970 seats? If so the frame and all the hardware are exactly the same as used on buckets for a 1970 Dart. If you want them to be year correct in the future you just need new foam buns and 70 Dart seat covers.

Yes all that hardware is correct. The big thing missing is the metal hinge cover with attached release button. When you say you purchased "rails" I assume that means the sliders that go between the seat bottom and the floor. I found that things were a lot more comfortable when I put the set of the black factory style spacers on all 4 corners of each seat - they go between the sliders and the floor.

If you are putting buckets in a bench seat car, there are factory reinforcement plates that get welded to the floor under the carpet. Ask if you need pictures.