Electrical Shore Connection
Without a picture of the hole in your '53, its hard to tell if this is the one or not. This is what my '59 had on it originally. Wish I had kept this one to put on. Its a Theo Bargman 60-0-03 and they turn up from time-to-time but the hard part is finding the cord end plug that goes into this connection. You can see the cord end on the next post.
Good luck and let us know if you find a source.
On edit: I can't get the second picture to load. I'll keep trying.
4CU 2699 / AIR 10 / TAC AZ-1
I'm haunted by aluminum.
Charter Member of the 4 Corners Unit.