Kelsey hayes brake calipers?

Dana67Dart said

Also 65, 66 and maybe 67? Mustangs, don't know if there is a difference in the machining or casting

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Yes there is.
Mustang calipers are different than Mopar calipers in the way the the Ford caliper uses a rubber flex line hose, and the Mopar uses a metal hard line, and the machining differences between the two.