Check out Clek car seats. I have 2 boosters in the back seat for my boys and they blend in perfectly. Black interior, and the black boosters are barely noticeable. They snap in easily to the cars anchor points and have a single strap for easy removal. They are also rated one of the safest on the market.
I know they are not BMW branded, but I understand those don't pass the US regulations. Anyway, good luck in your search.
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2016 F82 M4 - Mineral Grey
2009 911 Turbo - White
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