@Moriarity Mike McConnell, the car was referred to as "Big Booty Judy" don't know if that's what it's actually called or if someone just referred to it that way... ....
I DO NOT KNOW if this is the car, but my father (Dee Wescott) talked about customizing a Plymouth into a 3 window. The story was the customer was a fluorescent light bulb salesman who delivered product from his car. He had several 3 windows in the 1930's that he wore out and when WW2 ended he wanted a new car. As 3 windows were no longer produced the car went from showroom to being customized. My father did not know of what happened to the car after the 1950's.