window regulator question

my dad's building a 56 chevy post and none of the door window regulators that came with it fit, i'm ***uming they are for a four-door. he was wanted to know if there were any other regulators that would interchange, like a truck or hardtop. thanks in advance

 

parts book says only 2 door sedan regulators work on 2 door sedans. (sedan = post)

so you need some from a 55-57 2 door post.

shouldn't be too hard to find, pm me if you can't find any