73-76 are smaller door panels, different length crank window handle shaft lengths too
doors go 73-76 then 77-87(91)
one of those doors may be a repop, check it for stamping brand, look in front of door on backside of skin in middle of door between hinge bolt holes areas, see if a stamp is there, i see alot of them stamped tawian there, they dont fit right, washers are between hinges and door skins on these alot of the times
there is variance 73-up, they dont all fit the same, you have to shim change what you have to if they dont fit right
i have swapped alot of pairs of doors 67-87 years, tons, all by myself everytime, i hang them on my shoulder just right and hold them in the jamb against hinges and start bolts in them and they arent diffcult to adjust, you can go vertical and horizontal at the hinges and make door sit higher or lower in frame, or in or out away or closwer to center length line of truck(suck them in or out tighter or less tight to weatherstripping)
usually yuo only need to readjust bolts twice and have it aligned perfectly once you jhave swapped doors enough times in the past, most recently were the doors off the 81 diesel onto the 81 pickup i sold to a friend, swapped them for him a couple weeks ago, and about to pop off the door son the 82 k10 project truck, we are swapping 86 ones on after they are primed, so we can test fit them and form and dry fit rockers and cab corners up too, then they will be off again, after panels are tacked, then back on to check again, then back off for painting, then back on again and finely adjusted, then fenders back on after painted, then the bed after its painted and assembled,
all to be first totally dry assembled in about a month, going ot go pickup good driver side door from a yard in springfield in next day or two, the tailgate work was started today, bed is ready for paint, and pass side door too, oh and the hood, its ready
good luck
