How do you change engine air filter Mercedes Benz r350?

Engine Air filter:

http://mbworld.org/forums/attachments/mercedes-tech-talk/212575d1308496152-r350-air-filter-removal-change-r500-air-filter-change-instructions.pdf

or

http://www.benzworld.org/forums/w251-r-class/1561162-how-change-air-filter-r350.html

Cabin Air filter:

http://www.benzworld.org/forums/attachments/w251-r-class/253570d1249836413-r350-cabin-air-filter-r-cabin-filter.pdf