Greg,
The DuPont 1954 Color Information sheet for two tone combinations shows only two interior blue colors and those colors are different from Mariner Blue and Transport blue.
That is a Dupont Bulletin, not A GM document. As you know, some information in that bulletin does not match Chevrolet truck sales brochures for the two-tone exterior/exterior.
Nonetheless, none of the GM documentation refers to three interior colors, and
illustrations refer to the two interior colors.
