I got a PM indicating the filters as well, and found some excellent information here:
http://www.peachparts.com/shopforum/showthread.php?t=9853&highlight=e320+cabin+filter

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1996 E320
2000 C230 Kompressor
1988 190e 2.3 - 225K miles, owned for 7 years. I cannot say enough good things about this car. Very well built, even at 225 it ran like new.