It's a 12V starter used on 6 cyl motors. 6 cyl has a 139 tooth flywheel?
Only thru 55.1 models (give or take a little) did 6 cyl motors have 139 tooth flywheels. After that, they would have had a flywheel with 168 teeth which mates up with a 12V starter.
Otto, I looked on NAPA's website earlier and they said out of stock in my area. But checking a different area (SOCAL) shows them available for $180.