http://cgi.ebay.com/Universal-Car-Alarm-W-Sleek-Remote-Keyless-Entry-37_W0QQitemZ300290481870QQcmdZViewItemQQptZLH_DefaultDomain_0?hash=item45eab51ece&_trksid=p3286.c0.m14&_trkparms=65%3A12%7C66%3A2%7C39%3A1%7C72%3A1205%7C240%3A1318%7C301%3A1%7C293%3A1%7C294%3A50

total costs = $28.98 shipping included. It takes me 1/2 hour to install it. I am very happy with it. You need to trick it to believe the door is open/close, as per my earlier post. Most system lock the car again if door is not opened within 30 seconds, it cannot be overrided.

__________________
Not MBZ nor A/C trained professional but a die-hard DIY and green engineer. Use the info at your own peril. Picked up 2 Infractions because of disagreements. NOW reversed.

W124 Keyless remote, PM for details. http://www.peachparts.com/shopforum/mercedes-used-parts-sale-wanted/334620-fs-w124-chasis-keyless-remote-%2450-shipped.html

1 X 2006 CDI
1 x 87 300SDL
1 x 87 300D
1 x 87 300TDT wagon
1 x 83 300D
1 x 84 190D ( 5 sp ) - All R134 converted + keyless entry.