[sdiy] Prophet 600 membrane keyboard bushings?

[luther rochester]

I just got a P600 and it needs some bushings for the keyboard. This is 
the membrane-type keybed, similar to late Pro-One. Not the J-Wire.

Pic:
http://analogknobs.com/images/misc/IMG_5904.JPG

Anybody know where to get these? I could order some tubing from McMaster 
and improvise, but if somebody sells the right stuff I'd rather go that 
route. I don't see them listed on the Wine Country page.

thanks
-- 
./luther