I don't know if this will help, but I just replaced the motor and blower wheel on my 1947 Harrison heater. The motor is VDO part number PM354, and the wheel (what I call the fan) was VDO part number BW9311. The only problem I had was that the center of the wheel was raised, and there wasn't enough of the shaft sticking up to solidly attach the fan. I ended up using a big socket and flattening out the center of the fan a bit (about 1/4"), then it worked fine. It took a few tries to get it even so that the fan wasn't tilted on the shaft, but it worked. There might be a wheel that has a flat bottom, but I couldn't find one. And the wheel is about 1/4" smaller in diameter than the original, but that doesn't seem to affect the air flow.

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