I guess one of the parts is the receiver for keyless door transmitter, but not sure which one (number 1 or 2) and what is the other?
The car is a 1996 E320.

Thanks for you input!

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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