After swapping PMs with Kevinski & Otto, I did a thorough comparison of measurements between heater motors.
I measured the original 6v motor from the recirculating heater I got from Ebay. Then I measured the 12v motor from Classic Parts. I compared them on a chart against a motor that Kevinski found at NAPA.
I'll be ordering the NAPA and returning the Classic Parts unit. See attached photo.
