Correct Master Cylinder

[weq92f]

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I recently replaced my MC and learned a few things in the process. What I didn't really understand until now is the picture not matching what's in the box is common. I ordered 1972 C10 MC. The picture on their parts house screen showed different sized reservoirs and a cast MC. What came in the box was an aluminum double same size bowl with two hold down loops. What I cared about was the 1 1/8 inch bore and dimensions being very close to the outgoing MC.

According to CPP, the deep vs. shallow MC piston hole works out simply to power vs. manual brakes. Otherwise the MC is the same. CPP offers a little puck to place in the MC deep piston hole to make it a shallow hole (it is proprietary to their MCs). Boosters are often delivered with both a long and short plunger rod going toward MC for the purpose of accommodating either type MC. As I understand things, these deep/shallow piston and long/short pushrod from booster are standard lengths all to accommodate either type.

-Kevin