i found this old ass link I posted a while ago where it listed all the GM colors, but when I went to it the link was dead and went to their home page. And then under the SEM paint the only thing they have for GM specifically is the leather colors. You could try their website I guess link. Other than that, I apologize for my worthless post.
edit: when I searched GM graphite, it came up. But nothing for tan. I would try contacting them.
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