Actually in Germany you can still select the colors specifically, including bright yellow. In the US it is generally a pre-determined and conservative color combination.

https://www.mercedes-benz.de/passengercars/mercedes-benz-cars/designo/center-of-excellence/exclusive-consulting-details.pi.html/mercedes-benz-cars/designo/center-of-excellence/exclusive-consulting-details

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Prost!