root -
I replaced my non-working 6v heater motor with a 12v heater motor from a 60 Impala. It's a little smaller diameter than the original 6v motor. (My truck has been converted to 12v)
Here is my 6v motor on left, 12v Impala motor before sandblasting and painting in middle, 12v FLAPs motor on right.
< CLICK >Here is the recap of my heater rehab with 12v Impala motor.
< CLICK >Here is how Deve put a 12v FLAPS motor inside his 6v motor case to preserve the correct look.
< CLICK >Gus (DADS50) has also put a 12v motor inside his 6v case.