Didn't see much in my search on the site so hoping anyone can recommend what some good options might be for my rear bench seat? Unfortunately I don't have the original frame. Thanks for any guidance.
Find an original. Very comfy, and they fit well. There's gotta be somebody around with one for sale. I passed a nice one up this spring at a local swap meet (but I bought the front). I think they wanted $50.
I built a 40 sedan when our bys were small, used the original rear seat. Driving down the road I could see their heads bobbing in the back seat. Yes the seat was rebuilt prior to covering. Adults in the back did not bounce so much, but still some. BUT, there is no better option that I have seen.
I've got the rear seat out a 38 Chev sedan in the storage loft, too bad you weren't closer, you could see if it would work for you.