[Scarebird]

Since I cannot use the existing Z-bar I will need to mount a hydraulic master to operate the Howe hydraulic throw out bearing.
This is a pain in the ass with a vacuum booster so I will fit the car with a manual master.

I did some research before and it boils down to this. The Mopar minivan master will work but requires the ears to have the holes moved outboard quite a bit. Best match is a 1" bore, while the Mopar unit has a 24mm (0.94") bore.

We refitted a friend of mine's 68 FB with a 1969 type front disc and retained the stock drum manual master (1" bore). It worked very well. I looked at several masters - selecting the 1974-80 1/2 ton truck manual master. These come with a deep pocket for the push rod.



Unfortunately the later aluminum/plastic units do not; the rod is held with a rubber boot that does not seem to be available anywhere. Note how the manual master has the recess (1) for the boot - the power unit does not (2).