Thanks Mick. I took the cylinders to First Choice Brake & Clutch (wholesalers) at Cardiff and they sent them to a bloke in Lismore who does special order resleeves, mods etc. They said he was an old bloke who's been around a while but he came up with zilch.
I'm really hoping some NOS will turn up somewhere. I scored a complete NOS master cylinder from Paul Miller Suzuki, a while back, which helped that end of things, it set me back $300 but geeze where can one find stuff like that nowadays, you have to grab it when you see it.
About 15 or more years ago a bloke at a local Stopmaster found some cups and dust seals but now he can't remember what they were for.
If nothing turns up by the time I start assembling these bikes (still have to paint stuff and rebuild the motors) I may just install the system anyways and leave it dry (preserved). At least they will still have a front, cable operated, anchor.