Collapsed as in won't stay upright? When I drove cab our shop used to just lift the covering and weld the seat back together. They used to break because some of the drivers kept their change in their pockets and when they went digging they put a lot of pressure on the seat back. That and the drunks pulling on them when they got in and out. Funny becasue everyone blamed the heavy guys but the skinny ones were the hardest on the seats. I stopped keeping my change in my pocket when the first seat gave out on me. I don't know if you looked into it or if it would be more expensive than the junkyard but maybe there is a shop that could fix your seat.