I re-covered the bench in my '71 recently, so maybe I can help. There are supposed to be two large phillips-head bolts, holding each side of the back frame, to the seat frame. It sounds like you only have one on each side. Should be an easy fix, once you find the bolts. You should try to find original style bolts, because they are a flat-head style, so they can't be felt through the seat cover (the seat back side frame is countersunk for these bolts). As far as the "feel" of the seat, after it's been re-covered, a lot depends on which style of seat you have, and it's condition. I'm told that there were two bench designs. They all have molded foam in the seat back, and that seems to hold up pretty well. Most of the seat cushions do not have molded foam, but instead use sheet foam over serpentine springs. Mine is like that. If the springs are not broken, you can add a new layer of 3/4" thick sheet foam, and get good results. If your serpentine springs are broken, you need to replace them. If your seat is the newer design, with a molded foam pad, you can buy a replacement. In that case your seat should feel like new. I prefer the original seats, because of retaining the stock seating height. My stock bench is really quite comfortable, and I put 100 miles a day on my truck. Hope this info helps some. Good luck!
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