The grease pen writing on the lid is to quickly ID what tire goes on the trunk without looking at the broadcast sheet.
The wheels were already on the car with no caps when the spare goes in the trunk, so they can see what wheel needs to be on there.
As we know dog dish gets body color wheels, full covers get black wheels.
So there is no reason to specify the wheel color on the trunk lid.


All we have is 3 different marks on trunk lids is R W and X.
They have 17 exterior colors.
What would the trunk marking be for a green, tan, or blue car?
Then among these colors there are 4 greens, 3 tans, 3 blues, etc

Ever seen a yellow, orange or butterscotch color code on a trunk lid?
Nope thats not what it’s for.