I have a good 1957 pickup electric windshield wiper motor. It was working fine when I took it off of my 57 pickup and replaced it with one with intermittent and several speeds.
According to H.A.M.B.s they are a bolt in for replacing the vacuum motor, in 55,56, and 57. I only know it came out of my 57.
Email me for pictures email@example.com 603 863 2621
$50 plus fixed rate postage at the Post Office. Thanks; Jim43