Pat,
The problem with regular DOT3 in a series is it can eat the high natural rubber seals. You need Girling or Castrol LMA OR Silicone Brake fluid.
The Clay,
The wheel cylinders are a different size F+R because it is a sort of brake proportioning. They are interchangeable- that is you could swap Cylinders F to R but you really don't want to do that.
I honed the cylinders I had on my 1965 88"-they were old, I'm not sure how old but after careful honing and new seals they've lasted another 10 years. Usually I find that the major cause of replacement around here is broken and seized bleeders/fittings. The bores are almost always recoverable as long as they aren't too pitted, if you flush your brakes frequently or use silicone brake fluid it really cuts down on the amount of water in your brake cylinders and hence on the corrosion in them.
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Matt Nelson
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1944 Willys MB, 1965 SIIa 88", 1971 SIIa 88", 1972 SIII 88" (gone to Chris Miazga), 1975 Ex-MOD 109/Ambulance, 1989 RRC...
 Well 2nd best anyway...
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