I have 03+ interior code 922 and 92i which is pewter leather and plastics according to another post I found. It is a medium-ish gray color. My question is this: all the color dyes I find are made to patch some other number format, like 9779 or 110D or similar. Those are apparently GM color codes. Where is a conversion chart so I can see what GMxxxx color code I need to buy to spray a bad spot on one of my leather seats? I'd prefer to use SEM classic coat for leather to do this.