If you don't need an exact match--
Go to your friendly auto parts store, and see what shades of "Silver" they
carry. The last time I got into this with silver, it was because Mazdas
silver rim & hubcap paint faded badly. I found that one of the off the shelf
variations gave an almost perfect match. I'd look at Mazda and Ford colors
first. There is also a company or two that will make custom colors in spray
cans--Tower paint is one. I had to use them to get red touchup spray cans
for the Miata non clearcoat early 99 red.