Subject line says it all!

A previous post from the much-appreciated group member Florian says "Alps 3011 series", which has led me here:

http://www.alps.com/WebObjects/catalog.woa/E/HTML/Potentiometer/SlidePotentiometers/RS__1/RS__1_list.html

Does anyone know which would be the correct fader I'm a bit confused as the travel would have to be 20mm, and AFAIK the impedance 47kOhms, but there doesn't seem to be any fader with that magical combination on that page.

for reference: this post: http://launch.groups.yahoo.com/group/tr-707/message/1174

thanks all!