I have a question on if a 88 dodge tailgate will fit on a 88 ramcharger as mine has had the roof taken off from previous owner

new to group i am in need of a in tank fuel pump assembly does any one know of a direct replacement or a easy modification to make it work? my grandpa give me rc 88k miles been sitting for over a year do to the fuel pump the one it had is shot and unrepairable. mechanic shops around here...