You may want to check with
http://www.classicandexotic.com/stor...g-service.aspx as I believe these boosters are thhe origin of the boosters on the CMP and others of the period.
Other forums have had good feedback on brake parts and customer service from
http://www.alretta.com/ When I called to ask about the box type master cylinder used on the C60X they weren't aware of the system (no surprise as it seems to have stopped production about late wartime as other technologies overtook) but seemed interested and helpful in attitude.