I want to add a license plate to a mod I want to rework for personal use. I have the car in BeamNG already.
Make a license plate slot under the rear bumper jbeam of your vehicle and copy license plate file from an existing vehicle and use node offset to fit it according to your vehicle
if you can find a JBEAM liscence plate file from another mod or official vehicle, copy it to the folder with the files for the mod