Fitments:

 

For Mercedes-Benz C250  2012-2014; C300, C350, C63 AMG   2008-2014;

  

CLS550, CLS63 AMG  2007-2014;

For Mercedes-Benz E350, E550; E63 AMG  2010-2014

 

For Mercedes-Benz GLK250   2014-2014;  GLK350   2010-2015; SLS AMG  2011-2015

Cabin Filter Installation:  The carbon side of Cabin Filter always faces the direction of air entry, and the filtered air exits from the white side, as shown in the youtube video.  https://www.youtube.com/watch?v=HVGkqkBd5VI