rear is a 15/16" bore and is a real common wheel cylinder, used on a lot of 1/2 ton chevy trucks. you should be able to get a whole new wheel cylinder for $5 ($4 at rock auto)
Fronts are 1 3/16 bore and are different LH and RH and unique to the big pontiacs.
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65 Bonneville Brougham 4DHT
65 Grand Prix 2DHT......now parts
65 Catalina 2+2 2DHT
65 Catalina Safari 4DSW
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