1966 Dodge Monaco

What would be different with the power brake MC, vs the manual brake MC?
I'm not sure, but there's a master cylinder for manual brakes, power brakes, and power disc brakes. The manual and power drum cylinders look the same outside, I'm guessing something to do with proportioning inside is the difference. The imperial master cylinder is the same as all other models with power drum brakes. According to Rockauto, and Raybestos, they both have a 1" bore, beyond that, they offer no other information.
PXL_20240731_150514401.jpg


There's several pictures of the power master cylinder in the parts book, but no exploded view. However, there's an exploded view of the manual master cylinder.
PXL_20240731_150103491.jpg


What was the part number of the master cylinder you received?
 
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