Technical What kind of master cylinders were used?

In case anyone reads this, the 57 truck slave only works with a throw out bearing fork or a long arm on a flathead tranny. You need more leverage for a flathead 3speed Tranny. A 1955 MGA slave works.



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This was on a project I picked up a few years ago. Looks like Mopar maybe?

 

International pickups in the early '60s also used a two-in-one master cylinder for brake and clutch similar to the one used on Chevy and GMC. The Ford hanging pedal assembly is the same '52-'56.