Guys
After reading this post , you jogged my memory.
According to the book "The gs enthusiast reference book" written by Steven L. Dove, in 1989.
Has a paint mix for the chrome wheels, per a service bulletin from Buick.
It is for all 65 & 66 all series & 67- 45,46,48,&49 series..
Also 67 series 43 &44 and all 68 series use a differant color.
I will be trying the formula the next day or so to see if it matches the silver gray on one of my orig. wheels.
Will post results.
Al