Don't know about any *official* Logitech pots but I do know that CH
Flightstick Pro pots work fine (at least for the pedals; haven't tried the
wheel pot). Just replaced a worn out Logitech throttle pot with a CH pot and
it smoothed the throttle input nicely. You can buy CH pots from CH at
http://www.chproducts.com/index.html . Look in their Online Store in the
Parts section.
David Erb