Counterfit merchandise has been a plague to many industries. Just ask Apple about its frustrations in China with fake Apple stores, or check out the new Fucci bag Brenda in the marketing department is showing off. Granted there is a market for people who want to save a few dollars and are perfectly fine with knowing they are purchasing a knock-off of the original.
However we strongly recommend you watch this video before you consider saving money on a safety component for your BMW. Have fun and drive safely!