You know guys, they used the one piece glass doors up thru 51 as far as I have found. Bought the doors off a 51 once for my 48. They appeared to be original and had an "adapter" like striker for the swing door handle latches to work on the pushbutton door latch striker area of the 51-54 door jamb. They were stamped steel like the others but had a piece of 1/4" or so steel rivited to it to catch the swing handle latch. They were zinc plated just like the others and obviously a production made part in a factory.
I don't know, it seems like they used up a bunch of parts on these trucks in later years.
Brian
