You might try Welsh Enterprises Inc, 800-875-5247.
They are a Jag parts dealer. I bought a remote booster / servo from them for our Anglia in 2006, as it had one that was leaking brake fluid into the diaphram chamber. I described it as a 'Universal Remote Booster' (Apple Hydraulics told me to call them and describe it as such, thanks guys). Not only did they have it on the shelf, it was what I needed, brand new (it was a Delphi part) not NOS and the parts person I dealt with was courteous and actually knew what he was talking about.
The best part about it? It cost me $150 ish + freight. I would give you an exact price and a part number, but I can't find my receipt.
It has three mount studs that come out of the diaphram chamber opposite the hydraulic cylinder.
I have no way to tell if it's right for you, but it worked for me. A search in Google might help you figure out if it's right for you (boost ratio, ultimate pressure gain, etc).
