Bill- I would have posted pics, but I couldn't find instructions on how to do it. Your photos confirm my suspicions, however. My wiper motor is definitely a 58-59, not a 55-57. Your shot of the 57 motor doesn't show the transmission arms , but if the pic is as it would appear through the radio hole, then that would explain the extra room. You are correct that the wiper motor rides a little above the radio, but the big plate between the motor and transmission is in the way of the radio box. The catalogs list the same radio for 55-59. Makes me wonder how the wiper motor is mounted differently in the 58-59 and still accomodate the radio.
