Did you manage to find someplace that could do the correct silver? Are you willing to share the cost for the powder coating?
the silver looks real close, I had a friend get the powder coating done for me, he has a lot of stuff done so he gets a good discount, I think all 4 cost me $200, they sand blast them before they coat them. The silver is the same as the Chevy Rally's, the name is argent silver, dull aluminum I think is the same. most powder coaters in your area should be able to get the color right