At some point,my original m/cyl was replaced with an aftermarket unit. I would like to get closer to original, but the 68 disc brake unit(no power assist) is rare to say the least. Question: will the '67 unit work? or (shudder) a camato unit?
The pistons on these are 1.875 dia. while the '68 bird is 2.0625.

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oseaghda
68 400 drop-top

67-69 power ft drum -will fit 68-69 manual
ft disc
both 67-68 caliper are 2 1/16
69 -81 are 2 5/16