GK6 was a less popular color than FK6. GK6 had to compete with other new colors for 1971 such as GY8 and GY9 and maybe that took away a few percentage build points. Anyone have the 1972 Challenger color percentage chart and colors available. Are there percentages for special order colors with a 999 code or something like a Mary Kay car or like the trucks were I worked around 1985 we built Pick Up Trucks in Purple and Yellow that were a Company Colors.