I don't know. But I believe the radar is expensive shiz, even as a used part. And if I recall correctly, isn't there some windshield equipment like lasers or x ray vision or something also integrated in the adaptive cruise? If that's the case then you need both whatever that module is, as well as a new windshield. Radar also needs calibration (which I can't recall if it's something you can do at home but if not then that's another visit to the dealer).