Back seat

I had a ton of trouble on my 67 fastback. I didn't know that the bottom seat was actually bolted down to the floor. There's a couple of brackets that hang from the seat and attach to the floor. You can view them by folding the top half of the seat down at a 45* angle and then looking in between the two seats. With most A body seats you just have to push the seat toward the back of the car and it'll kind of pop out on its own.