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My thought is, if all the HHR headliners are the same color, then it's a waste of time looking for a trim "color" code. Doubt there is one that pertains to the headliner. Just a part #.
I have access to the GM parts catalog, if you give me the last 8 of your VIN I can look up the RPO codes and/or the part # for the headliner specific to your car... may or may not help