What are differences between 67 -72 bench seats ?

[Yabbo]

I found a great seat frame in a junk yard truck. It still has the factory metal tags dated 1971. I received a free hand-me-down vinyl cover off of a 70 seat frame. It's about 4-5 inches too small. If in were to compress the springs somehow and get the vinyl to streach, thwre would be no give or spring to the seat.

My findings are that 71-72 seat frames are slightly different than previous years and the depends can be full depth foam or not.

Ordering a new seat cover soon for full depth foam for a 72. Hope it's the correct size without too much heating and stretching needed.