It all came down to the number of teeth on the gear, 9 or 10. Pulling the old one showed that I had 9.
Bonus points to the local O'Reilly store who ordered one of each one to let me compare, then sent the others back with no charge to me.
Boo to Autozone who would only sell one with the regulator costing way too much.
Can anyone tell me where the sensor is that tells my truck when I have a few extra dollars in my wallet thereby causing something to break? I want to remove it.