If you are coming up empty-handed, there is another po$$ibility, the caliper bearing brackets.
Hope it isn't cuz it's a huge job, here is a link that shows the job, it is a PDF so you will have to click to allow the download:
http://www.google.com/url?sa=t&rct=j&q=&esrc=s&frm=1&source=web&cd=3&ved=0CDwQFjAC&url=http%3A%2F%2Fwww.benzworld.org%2Fforums%2Fattachments%2Fw126-s-se-sec-sel-sd%2F291870d1266619920-rear-wheel-bearing-replacement-procedure-needed-35-360-rear-axle-caliper-carrier&ei=SFyhULiiMabUyQHA7YD4DQ&usg=AFQjCNG3_MQ5xVbI-Cyzas3Ysr4pZxsuGA

Caliper carrier MB calls it, I think parts dept called it a bracket. Anyways it's a real pita.

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