I'm pretty sure it can be retro-fitted to any X3. Of course, you should check with the dealer to be sure though.

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2005' X3 3.0 Automatic
Titanuim Silver
Aero Kit II
UGDO, Compass, Auto-Dim Retrofit
Interior Matte Titanium "climrgrl" Retrofit
Heated seats & steering wheel
De-badged
Chrome Exhaust Tips
Privacy Glass
Pano Sunroof