70--71--72 seat questions, pic request?

OK the seats in the pics are from my first car a 71 340 duster now some here say they came from a 72 seems the legendary catalog backs that up I can't verify the build date of the car(maybe late 71?) because I cut the car into little pieces in 1986 because the left front frame was severely rotted(yes I saved lots of the goodies) then scrapped those pieces and gave the title/vin tag/fender tag to Galen Govier when I had him do my current dusters fender tag..... don't ask me why I did that because I don't know why!? DUH MY first Car!:banghead:

Now on to the point....

My current car came with a bench but now with a roll cage I would like to use these buckets **BUT** I want to recover them to correct 70 low line(no applique)

So I guess my question is what are the differences(WITH pics preferably) in the side and rear of the seat? do 70's NOT have the plastic back?

Help me see the light.