72-80 use the same gate... 81-93 use the same gate....it will physically fit in the opening but the latches on the sides of the gate are different. the 72-80 have a tab with a rectangle whole in them and the 81-93 use a striker bolt design. its really not a bad swap just cut the rectangle latch tabs from the 80 bed and drill holes in the proper location for the striker bolts to be used with the 81-93 gate. i recommend putting a reinforcement plate with a nut welded to it for the striker bolts.... good luck its really a pretty straight forward swap if you have a grinder and a drill. the welding of the nuts is optional...