My 71 has a G code (Yellow) however it's factory color is light blue. There is a problem somewhere.
As an aside, I didn't know if you guys still have the sticker on your door jamb, but it gives a lot of details as well, like the month your truck was manufactured, and where. Mine was a Michigan truck, manufactured in January of '77 ;D
Could't find a tag on my '66, but it's the same color as "Shamu's"
It has a sticker on the air cleaner that says "Stiles and Sons" Witchita Kansas.