I have a supply of brake cylinder boots, that I had in fact bought from Vangards a long time ago. There is about a dozen each of front and rear. They were not hard or perished. They were soft............mmmmm...soft. I didn't put them on for the photo because I have put them "somewhere safe" and only found them after reading the recent postings regarding them.
I looked into having the cylinders re-sleeved, but new ones were only $10.00 dearer (for the two) and that included shipping from U.S.
Presently got four master cylinders, at least one of which is not requiring any work.
Hopefully, the only thing that will need to be rebuilt is the vacuum booster. If it's minor rebuild only, there is a place in Brisbane that manufactures seals & rubbers. If major rebuild is required, I may send it down to Adelaide, to the place Bob told me about earlier.
There is a good and helpful brake shop here in Gympie that will assist me in learning how to manufacture new brake lines properly. All the parts can be bought from Macs Auto, once again, mysteriously cheaper than buying down the street.