After taking a tour at the N J VDC last week and talking with one of the BMW guys I found out that BMW offers 4 different M packages for the X3 and they have reflectors that could fit into the bumper of the older model X3 if you cut out the recess in the bumper for the reflector.
cheers
vern

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2006 X3 3.0iA 4/6 Build Date-Silver Gray Metallic-Black Leather-Nav-PP-SP-PDC-Xenon Headlights-Heated Front Seats-Privacy Glass-Servotronic Steering-Premium Sound System-Red Rear Reflectors-Wheel Locks-Rubber Matts-Euro Delivery 5/18/2006-Redelivery 7/17/2006