There are a few avenues to try out. I probably have color formulas for what ever that color is, but, there is no cross over from super old to the new style paints. I encountered this when painting a 914-6. I called the paint co in ohio and asked the paint experts. This was the response.

You can take a sample color and have them match it. A large paint store will have a paint analyzer and can come up with a close formula.

Or, you can look through paint books to find something close. We used glasurit and they have a system of sprayed out chips with variations of every color. For example the white on a taurus has 6 variations of white you can pick from.

Or you can just go into the paint store and pick a color that is close. That was the option the 914-6 guy opted for. Having a modern code makes it much easier to get paint when you need some.

There is a possibility there is a factory pak from glasurit in europe, but that is a bit extreme. It would be enamel and it's a pain to shoot and it sticks to everything!

This is a PPG deck for mazda from the 90's. It just happened to be sitting here next to the computer.