||The color from the factory is a neutral, med-dark, satin gray.
I doubt there's an original "code" per se... I'd think it'd be more of finding pics or a very original Z and eyeballing.
Now, if you had access to another original Z to stand next to, you could take some gray paint swatches from an interior paint store just so you could get super close. ;-)
Former Stage V addict... off the wagon.