I am fairly certain they are hyper silver. So it is a multistage paint, I have asked at the dealership, and they did not seem to be able to provide any touchup paint, or know anything about the color. I checked with a place that refinishes wheels and they use PPG paint. It is quite a process to get it just right.
If you want to do it yourself there is this;
https://www.duplicolor.com/product/h...ilver-coating/