You may be best off looking for another Pickup with a good bed on it. There isn't a lot to pulling one off and replacing it. Well you do need to cut it off and weld it back on. If that is out of you skill set or tool box then maybe just cutting off the existing metal down to were you can attach some new diamond plate steel or thinner steel for a new bed. That still leaves the attaching work to the older bed up in the air. Weld or overlap with new steel and caulk underneath that to seal it? I would be putting a coating of bed liner on it on both sides before installing it. That way all the parts below can be covered and you won't be getting rust in the future.I would like to replace the floor of my 1982 Rabbit pickup bed, mainly between the wheel wells. Searching internet hasn't been productive. Any ideas?