I will post photos of the "Cheapie Cup Holder" suggested by another post as soon as I can figure out how to do it.

Go to this site and do a search for cup holders:

http://www.performanceproducts4benz.com/

They have a few listings that are similar. I put the single cup type that they have listed fro $37.00 in my 300e, but I got mine at a marine supply store for about $8 bucks.

No problem with wiring when mounting them as I cut the supplied screws so that they only penetrated enough to hold. Later when I had the door panel off I noted that there were no wires behind it anyway.

$37 for a piece of plastic is pretty much overpriced from this part seller while the same can be had somewhere else for less than $10.
Considering this is a mass product and not specific to a car model or even car make, people selling at this price ($37 and up) must think Mercedes drivers are rich and/but dumb.

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1996 E320 since 1/16/08, 171K miles as of Feb 2011

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1989 300CE - R.I.P. Dec 29 2007
Other MBs (sold): 1992 300E-24 - 1979 350SLC - 1984 230E - 1990 300CE

Apparently those cup holders are covered in about $33.00 of MB-Tex. Like I said, I got two plastic ones at a boat store for about $10.