a-body Master Cylinder Dr. diff. Aluminum Master Cylinder $85 + shipping

j_anderson said

curious to know the difference in pedal feel between the two bores with power brakes. are you a disc/drum setup on your 72?

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I originally bought master cylinder , for my booster for drum brakes front an rear , I ended up converting to disk with same booster , I contacted Dr. diff. after I had purchased and said if I had disk front an rear would have been better , but it would work with my booster but could possible have pedal travel , so I just purchased the other size master cylinder for my setup .
This will work on many applications as it gives more pressure , the Dr. diff. site has info and you can contact them with questions I cannot answer