My 97 E420 doesn't have a PS filter-it's a W210, which may be what you have (I've not sure).

Checking the Buy Parts button on this site might tell you whether or not your car has one.

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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