I found this one day, I dont know if it would still help you.
I just copyed it in here
I would strongly advise against trying to rebuild one of these by simple
re-kitting. Have tried to do this a couple of times, as have others and I
can assure you that it doesn't work, or doesn't for long. There are people
around who will re-sleeve the cylinder and put new seals in it. I'm told
that this is more successful but have not tried it myself, preferring to
use a new cylinder when required.
Assuming you can find a new cylinder of course....The local (New Zealand)
"expert" on resleeving these cylinders with stainless liners is:
Just Brakes
340 Church Street, Penrose, Auckland, NZ
Fax +64 9 525 7509
Ph +64 9 579 4666
I haven't used them, but others have (for these particular cylinders), and
say that they do good work. Provide a 25 year guarantee, FWIW. They also
claim to have kits for most cylinders. Could be worth a fax: It wouldn't
cost much to send your cylinder over the Tasman if you can't find anybody
suitable in Aus.
If it's just a kit you want, the usual EU suppliers should also be able to
help(?): EB, Highwood, Rainer Hurtiene etc. In practice there are probably
some generic seals that match: have you tried taking the seals along to your
local PBR agent (Repco)? They certainly have the seals for the boosters.
Let us know how you get on!
Mark Battley