For one the reason they don't carry the paint is because the plastics are not painted they are Dyed, the only reason you will have paint on them is if someone else painted them in the past. . Your local paint supplier can scan your plastic and get the color codes for mixing any reputable body shop uses this method. but Tans are whites, browns,yellows,reds, greens, depending on what desired color tan you are looking for. But I have to tell you unless you are bulldogging it, using a flex based paint and plan on baking the paint on the don't look for it to last. Good Luck though