The invoice says they installed 211-330-04-35 ($82). I have no doubt that the dealer installed a bonafide MB part. I'll have to ask them what they think happened - but they did say that a good balljoint can wear out that quickly.

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1996 C280 289K Traded
1997 E420 167K Traded
2001 S430 240K Traded
2010 E550 4matic 80K
2000 GMC Jimmy 198K Gone to Boneyard
2003 Camry LE 196K
2011 Mazda3 i Sport 31K