I'm thinking of buying some used alloys off ebay. I have no idea what to ask the seller. I'm interested in these:

http://cgi.ebay.com/ebaymotors/ws/eBayISAPI.dll?ViewItem&rd=1&item=7919613352&category=43955&sspagename=WDVW

What do you guys think?

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You don't need a weatherman to know which way the wind blows - Robert A. Zimmerman

I hate it when sellers trying to auction wheels don't give all the salient details about the rims. Kuan, you're going to want to know the offset (ET measurement) and equally important, make sure that the hub opening, since Mercedes is "hub-centric", will fit the hubs on your axles. Audis tend to have smaller hubs than Mercedes, so unless you were planning on having the hub openings machined bigger, then the size should be verified.