I don't recall his coming up before and personally, automatic headlights drive me absolutely crazy. That said, they may be just what you want, so don't mind my opinion.
Start your research with the online manual -
here. On the Floor & Roof (D/C) configurations page, at Connector D38, is where the Lighting Control Sensor plugs in.
So, now you know what it is called, go to one of the online parts suppliers, like Partsouq, to find the part and get pricing.
Post your results up here.