So about a month ago when I was driving my seat fell back completely. I pulled off the road and tried to put it back into position but it wouldn't lock in place. I drove home with it down and since then have been using an old squeegee ducktaped to the back of seat and lodged against the back of the cab to hold it up. I am looking to either fix the problem with the seat or buy a seat from the junkyard that I can put into it. I have a few questions though:

1: Since the driver seat and the middle are separate from the passenger do I just have to replace them or the entire seat?
2: Which seats will work in this truck?
3: What part of the seat mechanism is broken and can I/how hard would it be to fix it?

Thanks in advance for the replies these forums are very helpful.