Also, do the c320, slk320, and slk230 all share the same pump as the crossfire cause I may go to a pick and pay to avoid paying $500 for a new one?
I can tell you that they do not, as I ordered one from eBay at a very low price just to see, and found that although the electrical connectors seem to be the same, the vacuum hoses are not.
I tried it anyway, it didn't work, possibly because it was bad to start with, I don't know.