911 interior color codes--where are they located?

[Forza]

"This code provides the colour combination of the main interior components and the interior trim components. The 2-digit colour combinations are not listed in this book. There are so many combinations it has not been possible to research and list them all accurately."

--from "Porsche 911SC: The Essential Companion" by Adrian Streather (p. 45).

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In the luggage compartment of my 1983 911SC, there is a sticker that states:

027 82
indischrot
G1

I know that the "027" is the paint code, but what do the "82" and "G1" refer to? Are either of these also related to the paint code, or is one of them the "2-digit colour combination" mentioned by Streather? If not, is there a place on the car where the interior code is listed?