TSB #53-17-03A
May 1966
RE: Aluminum Wheel Refinishing.

Color Selection:
If the wheels being painted were previously clear coated aluminum, we would recommend using Corsican Silver WAEQ9283 for a "fine aluminum" like look, or  Sparkle Silver Paint 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.

Thanks to Jack C., member of the Reatta forums, for this information.