WTB: Round fader caps - "rolo" style, Langevin, API etc

[chuckj]

Hello. If anyone has a surplus or knows of a source for round fader caps in the style of the API 440 faders or the Langevin/Electrodyne style "rolo" caps please ping me. Ideally something that would work with the shaft on this Alps fader http://www.mouser.com/ProductDetail/ALPS/RS60112A600N/?qs=seHrhfPpLDyVAxCZ10DkzQ%3d%3d

Alternately, a source for shaft adapter inserts that would enable me to use the CAPI or other round control knobs would be appreciated.
Thanks!
chuckj