There's "50 shades of gray" that you could buy that will match closely in spray can formulas

Totally Auto sells a spray can formula just for Mopar gray jack color matching

Most spray can paint stuff today totally sucks due to VOC compliance, so depending on how detail/quality oriented you are, you could have your local paint jobber mix a quality paint to gun spray once you've determined a correct match hopefully from an actual jack component, choice is endless...