if you still have your old US headlights, you can reuse the rubber trim. It is held to the headlight housing by rubber tabs; just pull it out and the Euro housing has the same slots for the tabs. Otherwise, you can get this rubber piece from the dealer for around $7 each.

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2005 Mercedes C230k sport sedan, 6 speed
1987 Porsche 924S - 968-engined track car