Call Phil at the FastLane toll free number. A lot of things don't appear on Fastlane inventory until someone has ordered them. I bought my carbon/pollen filters for my 1998 C230 through Fastlane by calling Phil when I didn't find them listed. They were Bosch, and less expensive than any other quote I got on these parts.
Also, do a search of the archives for installation - it has been coverd several times. Or find the DIY instructions with diagrams for your model at the Bosch site: http://www.bosch.de/aad/en/produkte/filter/innenraum/einbauorte.htm
2003 Firemist Red/grey leather SL 500
2015 Palladium Silver/black mbtex GLK 350
1987 Smoke Silver/burgundy mbtex 300E Sportline (SOLD)
Click to see 87 300E