The clips are often the only thing that breaks (the link that X5Chemist posted) but you have to buy aftermarket, they're not available from BMW. I used to keep a couple in my garage since I think I had five of them break in the 8 years I owned the car.

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2003 3.0 5MT Topasblau
Purchased in 2016 and sold in 2024
2012 35d Platingrau