I picked up a pair of aftermarket bedsides that sort of look like they would fit - with a lot of persuasion. My 1980 had 2 beds that rotted - one on the outside seams, the other on the floor seams. When my friend and I went and got the third bed, we were so concerned that the bed seams in and out were good, we forgot to check the inside of the gas filler door - after we got it to his garage, we opened the door, and it was all but rusted away - that is why my gas filler door is shaved and the neck is now on the inner fenderwell under my tonneau. We also shaved all the outside bed seams by welding them in and had a custom roll pan made and welded it in.