Hello Bill,
On the G503 forum there was a thread concerning Chaffee Hydramatic transmissions and there were 4 pieces for sale.
That has been some time ago but it might be that the seller still has one ore more.
This is the link:
http://www.g503.com/forums/viewtopic...ission#p838617
This is the sellers email:
m38a1md@yahoo.com
Succes,
Marco