Jerry:
When I had the same problem, I was referred to the racing people, such as
Truechoice and Pegasus. The Truechoice catalog lists rebuild kits for
girling master cylinders in .62, .70, .75 and .87 for $12.40 each. I bought
new cylinders for my TR4 from them, although I wasn't able the get the
original large reservoir cylinder at what I thought was reasonable. I wound
up with a TR3 type brake cylinder with a plastic remote reservoir. Since I'm
building mine for an autocross car I don't care about originality. Anyway,
there are lots of places to get brake parts besides TRF and Moss. You're
also right about the rings on the cylinder body denoting the bore size.
Good luck,
Don Marshall
'57 TR3 '62 TR3-B '63 TR4
PS. I forgot phone numbers...Truechoice is 800-388-8783, Pegasus is
800-688-6946. I have no association with either, etc, etc.
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