Cougar Bendix Master Cylinder casting numbers

I hope that someone in the Forum has knowledge about a Bendix Master Cylinder casting number that I’m not sure about.
I know that the casting # 2227161 was used in the MC’s with power disc brakes - all engines, except the for the 429 which had a Bendix MC with casting # 2227091. Does anyone know what the application was for those MC’s cast with the number 2225751 ?
Was it for manual or power drum brakes, both or neither ? Thanks for any assistance that can be provided with this question.

The best I could come up with is manual disc/drum rear 1in bore.