With Greg_H's help, I landed a VDO PM354 motor from my local O'Reily's.
Had to do some modifications to the heater motor support bracket due to the length of the new motor vs original. I had very little room so fitting the new motor was a bear. Nonetheless, got the new motor squished in and up and running. Will say it is far noisier at the slowest speed than my original 6v motor at it's fastest speed. Not sure how long I will last with it.
Here's some pics:
Pic 1 Pic 2 Pic 3 Pic 4