I've seen some paint chip sets out there with the colors for the later models, but you might contact the Autocolor library people and talk to them. I emailed them and they provided me with a color chart for my 1928 model. They have a lot of the codes and can mix the paint you want. You can also look through the colors on their page and try to find the one that your car uses if you know the name. I found the 28 Durant colors there too.
Where Are You From? Oviedo, Florida
Do You own a car built by Durant? 1928 Durant Model 65