Thanks for all the usefull information.

Doesn't look like I'll be getting a discount from the dealership anytime soon. They don't give a discount to Mercedes Club Memebers, looks like you have to be a parts dealer or repair shop of somekind. Thats what I was told at the service counter? Oh well! Don't suppose there is anyone who falls into that category in the SF Bay Area that might let me know next time they plan on buying some parts and perhaps I could get a discount? Its a long shot, but it doesn't hurt to try

I was also suckered into those vented rotors on E-bay-- I thought $39 bucks for both front rotors how can I go wronge? When they arrived they had made in China stamped all over them and the metal looked questionable, it had a greenish tinge like it was molded from a mixture of cheap metals. I could not bring myself to install them either.