Vehicle specific installation instructions for the European models can be found at the Bosch site http://www.bosch.de/aa/en/produkte/filter/innenraum/einbauorte.htm
There are sometimes differences between the US and European models, but this was accurate for mine.
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