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[T3] Master cylinder question

<x-charset Windows-1252>Hi, I need to replace the master cylinder in my '65 Type 34.  I picked up a
couple NOS FAG master cylinders recently:
1. 311 611 021A - Brake master cylinder - 20.64 - single circuit drum
brakes - to chassis # 221 974 and 365000001 - 365220883 for models 361-368
2. 311 611 023 - Brake master cylinder - 19.05 - single circuit disc
brakes - '66 or '66-'67 only, depending on the model  (Type 34s went to dual
circuit in '67, a year earlier than the other Type 3s, unless they had
option code M139)

My parts books lists my original master cylinder as 311 611 021B - single
circuit drum brake - 19.05

1. Can I use either of these master cylinders?  I have been told there is no
problem upgrading to the Squareback 20.64 master cylinder by one shop I
talked to.  They said they actually only sell people the 20.64 one.
2. What's the difference between the 19.05 drum and disc brake master
cylinder?  There appears to be no physical differences.  Internal valves?
3. Should I disassemble and lubricate the NOS master cylinder with brake
fluid before installation?  Both are in perfect external condition and the
pistons moves smoothly when bench-tested..

Everett Barnes
'65 T34

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