Compatibility between power and manual disc/drum master cylinders

Yea, I am concerned with the structural changes between the two. And sorry I forgot to mention that it's a 70 swinger


I got mine at Oreilly's and it was correct. They are remanufactured and the manual brake one is on the right below.

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I personally like remanufactured American parts rather than new import parts. I actually got lucky and got a real Mopar casting.