Its surprising how many surfaces/parts on our cars were originally galvanized. You know the finish - different colored geometic shapes in different gray and silver finishes. A while back I was faced with the need to fix some damaged pieces as well as complete refinishing of some parts for that 69 Shelby I help with.
After talking to a few platers few had the ability to do galvanizing and the new plating didn't resemble the finish that we remember so well or is present on many nice original parts. After having some pieces plated we simply gave up on that attempt and instead played with the possibility of reproducing the finish using paints. It took a half dozen or so attempt with different products and methods but we finally came up with something that seems to work.
What we found is that you can reproduce the finish to look like the original and the method can be used to fix small areas of a galvanized part if it has become damaged from the elements, exposure or wear.
Hope some find this article useful - Enjoy.
Full article can be found in the Library section of this site under all classic years.
Here is an example
Light and contrast not great in this last picture - looks better in person