How to set default rims for car?

So, I'm working on a car mod and I have it using the gavril grand marshal setup. I downloaded this mod: https://www.beamng.com/threads/mitchellknb-wheelpack.36969/ and it works fine, but I'd like to make one of the wheels in this pack the default wheel for the car. How would I go about doing so?
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I forgot to mention, I know that I could just save it, but I am planning on releasing this car at some point, so I can't do that.