Based on feedback from RedSteelButterfly (thank you for understanding our miscommunication), we've brought the vehicle repainting garages up to par with the xterm-256 support. The way you select your color choice is a little different from before.
First, you pick the color family exactly like before. This hasn't changed.
Second, you pick from a much shorter list of colors. We've pruned out all the BS choices that were present before. The list of choices here is dependent on your skill.
Finally, in the new third step, you'll pick your finish. Again, the list of choices is dependent on your skill.
Each color family shares a common set of finishes except for the last few finishes in each color family very strongly relate to that color family. Only the most skilled painters will be able to repaint vehicles with these.
Thanks for the feedback RedSteelButterfly!