Dual Pot Master Cylinder Conversion 65 Dart

For my wife's '64 Barracuda I went with Dr Diff's 15/16" master cylinder, 2 bolt to 4 bolt adapter, and manual proportioning valve. Bent up a little Ni-Cop and I was done. Exact same system in my '65 Belvedere, works fine.

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Thanks. So an adapter is needed for the Master cylinder? I haven't worked on any early A's yet.