Changing the car numbers

So I've got a lovely grid set up for my singleplayer championship when I realize that several cars have the same number. Infuriated that this would happen when the number range can literally go up to 999, I'm determined to get these numbers changed rather than find a new car/skin. How would I go about getting the number changed on a car everywhere from on the car itself to anywhere else I'd need to have the number changed (standings? Replay header?) Any help would be appreciated.

Note: I did just download a tool called Geditor and intend to learn and use it, but would it work on changing the numbers on the number plates or is that a skinning issue?
 
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