The first place I'd try is TCP Global. They were very helpful when I sourced paint for my 32 Tudor. In any case, the original Ditzler code for the "Brewster Green Medium" color (real dark) is IM-328. You also may be able to get paint from your local automotive paint supplier using the Ditzler code to get paint in your choice of paint system. That is what I did.
www.autocolorlibrary.com
TCP Global
Las Vegas, NV 89115
858-909-2110
[email protected]
Let us know how it turns out.
John