OK, I am putting this here for future cross reference. I know for sure these SEM Classic Coat Colors work on the 03-07 classic interior.
The first color is based off of feed back from 2 different sources saying that was a match to that interior color code. The last 2 colors I have personally verified.
52D/52I 522 = SEM 17183 Med. Neutral
69D/69I 692 = SEM 17223 Very Dk. Pewter
92D/92I 922 = SEM 17163 Med. Dk. Pewter
Here is SEM Website on the SEM Classic Coat Product line and colors.
https://www.semproducts.com/product/classic-coattm
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!!WARNING!!! DO NOT USE THE ADHESION PROMOTOR OR THE PLASTIC CLEANER... They are Solvent based and will lift the paint off the plastic when you go to wipe them.
I recommend washing with Warm soapy water. Do not use anything with a Solvent or Alcohol. If you still think you Know Better, Test in a small inconspicuous area like on the back side.
Here are the 2 sources that state that SEM 17183 Med. Neutral Color matches for 52i interior color code.
www.dieselplace.com
www.gmfullsize.com