With that blue hue to the wheels I would say that's neither anthracite or gunmetal. Gunmetal is darker than anthracite, but doesn't have as much of the blue/cyan tone to the highlights lack that. Gunmetal and anthracite would be more like: Anthracite... Gunmetal: That's just me using the RGB values to try and match other peoples versions. But as others have said, you are better going to the shop and seeing their samples and comparing it against the car. Their colours may be vastly different to other manufacturers. Only advice, Don't go to dark, or black, you lose the detail in the wheels, more so in photos.