[tubman]

On my '51, it is on the linkage midway down the steering column in the engine compartment. I was able to buy a reproduction switch and bracket a couple of years ago, I believe it was from "Shoebox Central". My car doesn't have backup lights, and I don't expect to add them because they are obvious and kinda ugly. I added it to activate a backup camera, which I find much more useful than backup lights. Given the mechanical similarities, I'll bet the same setup will work on a '53.

EDIT : I just checked and they list the bracket for '49-'51, but not '52-'53. I'll bet you could make one work though.