Morning Fabian
Welcome to the Forum
Take a look at www.realoem.com it is a BMW online parts list if there is a replacement part that is where you will find the part number. Just put the last 7 digits of your Vin number into the search box it will bring up your model.
If there is a part take a look at www.newtis.info This site is a BMW technical information site BMW Dealers and Technicians use this for repair and replacement information.
Dave