I destroyed the squirrel cage on my heater while trying to remove it. I found what I think is a replacement at The Filling Station.
The squirrel cage is part # AF-225. It says for a 59 - 90, but the measurements look to be the same as in my 53. I am also going to get the 12 volt motor #M-846, as I am swapping over to 12 volts. By the way, the heater I have is a 1949 fresh air.

Tim

I am currently digging back in to a 1953 3800 (one ton) with a nine foot bed. I've owned it since 1979, and drove it until 1982 (or so). My wife got me involved in restoring it back in 2002, got the body removed and the frame redone, then things came up. Now I am retired and starting again. If anyone is interested I have photos on Imagur ( https://timwhiteblues.imgur.com/ ). I live way back in the woods in the Ozarks on 40 acres at the end of a 2 1/2 mile private road.

Tim