I located the build sheet for my 1966 Buick Wildcat GS convertible behind the right front seat back but have not found any way to tell what the numbers mean. If it was a Chevrolet there is a good site that has that information but I don't think Buick would be the same.

Also my paint code is 1 E and the E tells me it was midnight blue poly as the lower color. The 1 should be the color for the top but I have not found what that might be.