Since there is an "official" BMW retrofit for this you can get the part numbers in ETK:
https://www.etkbmw.com/bmw/EN/search...E4/ECE/03_1534
The example here is based on a 650i F06 car. Please specify your options within ETK accordingly and you will get the official part numbers necessary for this retrofit.
New parts will easily surpass 1000 + labor costs to be added unless DIY.