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thats the correct master cylinder and booster for a disc brake equipped B body WITHOUT a hemi .

FYI the cap should be BLACK also



I agree.

All 440 Superbirds I've ever seen have this configuration like your photo. In fact, that particular casting Bendix master cyl is getting harder to find as a rebuild. You may get something that interchanges and fits, but isn't correct looking.

Since you have already have the correct one, I would consider having your local parts store send that one sent out to be rebuilt. Certainly do not return it as a core.