What is the correct master cylinder for manual disc

cosgig said
Kelsey-Hayes 4 piston discs were available on an A body starting in 1965, I believe, 66 for sure. They were used all the way up through 72 when the rim bolt pattern was changed to 4.5". Also available on B body cars through 69 with the large bolt pattern. If you think the A body stuff is hard to find, try finding anything for the B body setup. YIKES!!! Geof
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The SBC K-H Abody calipers first appeared in late 1964 on the Barracuda. These remained as the only Abody disc brake option until the end of the 1972 model year, when the LBC '73 discs became available.