I have a 61 Special, which i put new belts into the front. I mounted them into the floor with some big washers and lock nuts. I was able to feed them thru the bench seat, but i don't know how they did it as a factory option. I guess the seat was modified a bit to fit them thru easily.
The back seat just pulls up real hard from the front. It has some funny metal snap-like things that really hold it into place. It only took me a few days to figure it out how to get it out. So just grab on to the front of the seat and rip it up real hard. Once the front of the seat is loose, the back will slip out.
Hope this helps you...
61Special
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