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1967 Ford Mustang Brake Pressure Differential Distribution Block C7ZZ-2B257-A or C, I can't tell which. Refer to the attached picture of the MPC text.
If you need a disc brake version (C7ZZ-2B257-D) the difference is the threaded on brass adapter. If you have a corroded or damaged unit you can easily swap this part out.
Original OEM Ford part.