63-66 a-body rear seat interchange?

not a charger said

Will the lower seat frames from a coupe and/or sedan interchange with my wife's 64 Valiant convertible? Or is the rear seat a convertible-only item?

Also, are the seat frames interchangeable between Dodge and Plymouth? I figured they were, but I want to be sure.

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I have a '64 Valiant Conv and the lower rear was trashed. The only thing that will fit on your car between the roof piston housings is a Dart or Valiant convertible rear seat. Maybe some other body family will work but I never found any to test. The conv seats are about 6 inches narrower on each side. I will attempt to attach photos of my fix.

I used the rear bottom from a hard top and cut it down to fit. It wasn't easy dealing with the spring steel but after searching around seemed to be the only way.