[Gary Logan]

I have scoured the interwebs looking for interchange info for full size back seats. I am interested in fit for the frames and not so much upholstery patterns.

Specifically, what back seats from other GM B-Body cars will fit into a '65 2-dr hardtop?

I think (dangerous, I know) the '65/'66 of each model/style are the same.
So, which are different / same: 2dr hdtp, 2dr sedan, convertible, 4dr hdtp/sedan?
Do all like model/style bottoms interchange? It looks like backs are different depending on width by model and speaker/no speaker and then there is the folding arm rest on the GP / Bonneville.

Some sources say the seats frames are interchangeable up to '70, some say '68, others say just '65/'66, and then of course google AI tells you something different every time you ask.

I believe like year and style (2/4dr, couple/sedan) from other B-body cars also interchange.

What is the truth? I just want to know what my options are if I replace the busted back seat bottom frame in the 2+2. Someone about an hour south of me had a couple of '68 seats for reasonable price that I can go pick up and not have to ship. -thanks