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no the box on 88-up taper in as thay go back to the tailgate area . the 73-87 trucks have a square box design.
i found this out 1 time by sliding a toolbox that sets on the box rails to the back of my old 83 and then it wouldnt fit up the back of the 88-up style truck i swaped it in to. i had to set it up in the box with a friend.
you might be able to modify a bit and but it wont be right.