Paint code for grey primer on the SS Hemi Dart?

That’s a tough one because there was so few made, I’m sure it was hand sprayed. They were expected to get finish (lacquer) when the racer got the car. Honestly if you sprayed it “grey” when is the next time it will be next to another vehicle one? Sorry if this does not help you. I have a tendency to over do stuff and find out later there was no “color” or “special something.” All because a guy told me this 20 years ago. Good luck and I hope you find your code.