On my 96 SL600, you push the clips to the outside, and them pull out the plastic housing that it is holding onto. I hope that helps... Let me see if I can dig up some pics to illustrte this.

As for the cabin filter, I didn't know it had one. Perhaps someone who has changed it could help you....

__________________
-Justin

91 560 SEC AMG - other dogs dd
01 Honda S2000 - dogs dd
07 MB ML320 CDI - dd
16 Lexus IS250 - wifes dd

it's automatic.