I recently bought a '50 special deluxe convertible. It has a square hole in the rear bumper deck. Any ideas about what might have been mounted there?
(https://westboulder.com/files/cars/1950plymouth1.jpg)
(https://westboulder.com/files/cars/1950plymouth2.jpg)
If the car had rear air shocks installed at one time, this hole could possibly have been used to mount the fill valve?
This car is very original. I don't think it ever had air shocks.
Could it have been where an extension/accessory spare tire inflator was mounted?