Hi, I have a used Bosch Vac can marked "579" on the link arm, it came to me in a job lot of VW parts so I don't know what distributor it came off, but it is clean and working, (i.e suck on the pipe and the link arm pulls in and stays in until you release the vacuum). It has had a repair where the vac pipe joins the body, it must have got knocked and was leaking at the joint, someone has fixed this quite neatly with JB weld.
Let me know if you are interested and I'll send a picture. Cheers, Bada Ben
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