Paint Chip/Colors Question

[Lurayfarmer]

Might anyone on this board have detailed information on the 1970-1972 color codes 521 and 522? Code 521 is white, while 522 is variously called "Copper" and "Medium Bronze." I have found various color code numbers (Ditzler, PPG, Sherwin-Williams, etc.), but it's much easier to go into a auto paint supplier with the exact mixture ratios. I'm just planning to get touchup paint as the truck has already been repainted. The nearest paint supplier with a paint scanner is a very long drive from my farm.