If there is an automotive paint supplier somewhere in your area they can probably special order it! Be aware, it is rather "spendy"! My husband did the interior of our 63 Bambi with zolotone and it came out great! It is a bit tricky to spray he says and he has done a lot of painting! It does tend to overspray a lot. There are lots and lots of colors, if they give you a one page chip of colors and what you want isn't there... look further!
If you look on the web, look for zolotone automotive!
Here is the link to the section of the thread my hubby did on our trailer when he used the zolotone. Look at about post #304 and beyond.
Mrs. NorCal Bambi (traveling in S Tardis)