Determine whose car it belongs to. You say that the five elements belong to gold, then the optional color is white, and white belongs to gold ... You can choose equally.
Black belongs to water, and the golden water is daunting. Black figures have the best relationship with the five elements according to color. The red series is a kind of fire, but it seems that there are not many models of the red series.
White and silver can be used for reference.
That's all. Personally, I think cars have nothing to do with yin and yang and five elements.