Kevs57,
I do not have '57 Dupont chips but here are interior color codes for '56 and '58 (I have chips for the interior colors that wewre also used as exterior colors - they are marked with an *):
1956 Interior Colors
Dupont Bulletin 28-A (1956), Truck Interior Colors 405 Empire Blue*
1619-H Crest Green (Ocean Green)*
1885 Oak Beige (Sand Beige)*
2168 Iceberg Blue (Crystal Blue)*
2411-H Cardinal Red*
2412 Forest Green*
no formula Marble Gray
73604 Charcoal
1958 Interior Colors
Dupont Bulletin 30 (1958), Truck Interior 2411-H Hearth Red (Cardinal Red)*
73605 Charcoal
91623 Concord Gray Metallic
* Also used an an exterior color
All colors were originally not available in enamel (exterior) and lacquer (interior).
Tim
