How do you determine the interior colour from the ID tag

I want to order new seat covers fro CJ Pony for my 1998 mustang convertible and am trying to determine the colour It is light grey but I can't determine what it is from their description. I took a picture of the ID tag on the door frame and was hoping someone could tell me from the code. It is either medium graphite or medium parchment I think.
 

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  • 1998 Mustang Convertible ID Plate.jpg
    1998 Mustang Convertible ID Plate.jpg
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