Hey,

I would believe that this works.

Here: http://www.xoutpost.com/bmw-sav-foru...inder-fix.html you see some pics of the part where the key cylinder is in.

Here the rest: RealOEM.com * BMW E53 X5 3.0d DOOR CONTROL FRONT
Nr.: 51218402538 would be for the right hand side door.

Good Luck