Testors used to produce that color in their Model Master Lacquer line, but that's now out of production. I realize that doesn't help you. I'm not aware of an equivalent color in the Tamiya spray paint line, perhaps British Racing Green. I don't think that color is dark enough though since Fathom Green is very dark, almost black under certain lighting conditions, and has an underlying gold metallic content. You can try hunting around on Amazon or Ebay, but most likely you'd have to obtain an actual automotive lacquer spray. If you were lucky enough to find new old stock from Testors, by this point, the can and contents would be highly suspect.