For Everyones info I emailed SSI (Sailsystems) and they said:
Hello,
Unfortunately we changed valves in 2004 and I no longer have replacement for 2001. I do have some of the old knobs but that's it. If the valve is leaking you may be able to replace o ring or flat rubber washer on the bottom of the valve stem. Is the valve brass?
We still make the 48600000, please follow the link below to view the current model.
New unit is $142.50 in stock and you buy from them.