1970 vs 1971-74 Challenger seat backs

[facair55]

Ordered replacement seat backs for my 1970 Challenger and could not get them to fit correctly. I notice the 71-74 are all one piece with the built in
button bracket, so no alignment needed. With a little modification can i use the later seat backs on my 1970 car. It's just a nice driver, so originality
not important. I also believe my seat belts can still be used.

[R/T's 4 R/P]

Are you asking if your understanding is correct? Yes. They will work.

[facair55]

Thanks, will order the 71-74 seat backs hoping they will fit better.

[torredcuda]

What exactly is the issue, are you sure the frames are the correct year, are they possibly damaged or bent? FYI - there are `70 style seat backs, `71-72 style seat backs but`73-74 seats were full vinyl back so no plastic seat backs on those years.

[facair55]

Thanks for the information, I believe my 70 Challenger has 71-72 seats?
The previous owner cut the bottom of the seat back (curve part) to make them fit.
so I ordered 70 backs and would need to do the same thing. The photo is of the original seat.

[Skid Row]

What exactly is the issue, are you sure the frames are the correct year, are they possibly damaged or bent? FYI - there are `70 style seat backs, `71-72 style seat backs but`73-74 seats were full vinyl back so no plastic seat backs on those years.

I find I have 73 seats with 70 covers(ACC) now 71-72 seat backs!
 Will that combination work?

[Bullitt-]

What exactly is the issue, are you sure the frames are the correct year, are they possibly damaged or bent? FYI - there are `70 style seat backs, `71-72 style seat backs but`73-74 seats were full vinyl back so no plastic seat backs on those years.

I find I have 73 seats with 70 covers(ACC) now 71-72 seat backs!
 Will that combination work?

  I doubt if it's feasible, different foam, frame & release , below is the 73-4 style

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[Skid Row]

Apologies to member facair55 for hijacking his thread.
It just hit me after I returned from the upholstery shop yesterday afternoon.
This issue actually started nearly 30 years ago when I found a build sheet for a 1970 model in a just purchased, mixed parts/ragged 73 Challenger that got me back to Mopar. 
 My question is, Are there screw provisions on 73 frames that would allow "seat backs" ?
 The upholsterer said he could add padding for the 70 model covers for me.
 
 Thank-You to all for your past, Present and future help assembling this basket case.

[MoparLeo]

I think that 73-74 Challenger has no hard back.  It is just upholstered.   
 At least that is the way it has been with my 72-73 Challengers with bucket seats.

[Skid Row]

I think that 73-74 Challenger has no hard back.  It is just upholstered.  Only 72-73 were one piece. At least hat is the way it has been with my 72-73 Challengers with bucket seats.

Thank you MoparLeo for your reply on this. I thought, 30 years ago (Someone) recovered my seats and never installed the backs.  Now I'm stuck with backless seat covers and seatbacks. I am hoping the backs can be attached to the 73 frames. I guess we find out in 2 weeks when my upholster opens them up.