http://cgi.ebay.com/ebaymotors/CAR-UNIVERSAL-AUTO-2-FOB-REMOTES-KEYLESS-ENTRY-SYSTEM-_W0QQcmdZViewItemQQhashZitem2a0f2b6413QQitemZ180643128339QQptZMotorsQ5fCarQ5fTruckQ5fPartsQ5fAccesso ries#ht_4121wt_948

Get this and save some money for other stuff. It works same and have very good range.
Search for keyless entry On diesel forum here and you will find very easy steps to wire this. I never touched electric stuff in my life and was able to install this in 2 hour.

Found articlehttp://www.peachparts.com/shopforum/showthread.php?t=283569

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1) '04 S500 Gold/Beige......120k Miles
2) '93 300E 2.8...Green/Tan MBTex..........202k Miles(and going)
3) '89 420SEL...Light Blue/gray Leather....155k Miles (Retired )