Where is the cabin filter on a 1999 slk 230 merc?

The cabin /polin filter on an slk 230 can be found in the pasenger foot well,remove 2 srews form plasric cover above back of foot well then slide plastic cover out then you will see a oblong plastic cover about 5 cm x 20 with a plastic slider at each end slide them back and drop cover then pull filter down and replace.