In Europe similar knobs are available here:
http://de.farnell.com/multicomp/cf-x5-m-t18/knob-plastic-16mm-al-cap/dp/1441066
(see Technical Data Sheet pdf)

But they only got 7 in stock...

--- In Doepfer_a100@yahoogroups.com , <yahoo@...> wrote:

> I don't know if any European dealer has the knobs in stock as we order the
> knobs directly from the manufacturer but not from a dealer. The knobs are
> custom made (not in stock at the factory). One has to order a minimum of 50k
> per shipment directly from the manufacturer and the production/delivery time
> is about 10 weeks.
>
> Best wishes
> Dieter Doepfer
>