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All the 80-96 tailgates will interchange IF you change the hardware around and how it mounts to the truck. Some had metal straps, some had cables, and there were different brackets and bolt sizes. If you have all the mounting stuff there for the original bed, you should be able to mount that stuff to any year tailgate and make it work, and at worst case, have to make a junkyard trip for a odd bracket or so.
Looking at the bed though, I believe it's a 97-up, and I don't think they will work.