I bought them from Jameco for 50 cents each, part number 136240PS:

http://www.jameco.com/webapp/wcs/stores/servlet/ProductDisplaylangId=
-1&storeId=10001&catalogId=10001&productId=136240&pa=136240PS

Keep in mind these are ¼ inch US shaft size (6.25 mm) knobs and
Doepfer and ASys use 6mm pots. So the knobs are slightly larger
fitting on the pot shaft. You'll need to be a bit careful putting
them on.

--- In Doepfer_a100@yahoogroups.com , amnesia <amnesia@...> wrote:
>
> Yes I love your choice of knobs...I am going to do the
same...looks
> vaguely like an old emu modular :-)
>
> What are the names of the knobs and where to buy them please
>
> Ross
>
> laryn91 wrote:
> >
> > I uploaded few pictures of my customized Eurorack to the photo
section:
> >
> > 1 – I never liked those dull gray Doepfer and the cheesy rubber
ASys
> > knobs. When I got my Zeroscillator, I liked Cynthia's knobs much
> > better so I replaced all of them (200 knobs!).
> >
> > 2 – The MCV24 LCD display was hard to read and its view field
was way
> > too narrow. I replaced it with a Noritake VFD. Plus it looks
very cool!
> >
> > 3 – My Zeroscillator pitch knob had no visual position
reference. I
> > replaced the knob with a 10-turn counting type. It also looks
cooler
> > and higher-tech :-)
> >
> >
>