TSB #53-17-03A
May 1966
RE: Aluminum Wheel Refinishing.
 
Color Selection:
If the wheels being painted were previously clearcoated aluminum, we would recommend using Corsican Silver WAEQ9283 for a "fine aluminum" like look, or Sparkle Silver WA9967 for a very bright look."

Note From Barney Eaton:
As alternates for paint suppliers.
WAEQ9283 = PPG #DBC-3531
WA9967 = PPG #35367

If I were going out to buy paint, I would try the PPG # 35367 first. The reason, over the years, I have purchased several (6-7 touch up cans) different GM silver paints and none of them had the high metallic content that the wheels have.