The book has color chips that are the exterior colors. But, no reference for the painted areas of the interior. (my hunch is, the same paint and and paint names were used that closely match the color of the seats and bolsters) In the book, there are swatches of the 'cordaveen ' (vinyl), nylon, and leather (for convertibles) There is a cross reference of the interior codes with the material swatches' codes. Although the color does closely match, that particular pattern in your car does not appear in my book. I agree that that pattern is from a later year than '55. I agree. I would bet that, the lower dash (including the door sills below the engine turn) were all originally painted the lighter Nile green (the color on your heater controls and speaker grill). And also my bet, the upper dash and sills (upper sills for the front doors) were originally painted the darker spruce green. Probably for the sake of convenience, the repaint was all done one color. (leaving the painted chrome pieces with the original paint, as most painters don't want to paint chrome) Dad got this book some 35 years ago. I've seen one other since then. You're most welcome. I'm very happy to share as much information from it as anyone wants or needs. Edit: We sent to SMS our interior code. SMS sent several swatches for us to confirm the order. Three of the swatches were the exact match for our car. The swatches that did not match our car, did however have exact matches with other swatches from the book. I was most impressed with SMS's quality and color . And ten years later I am still impressed with the quality.