Better Cars in the World(s)

I have many cars I'd like to see driving around in the game along w/ the default debug cars. Is there a way I can add More cars or override the existing cars? I know sims cannot actually interact with the cars, but I've put a lot of work into making my world look realistic and would LOVe to be able to have better cars driving around as part of it.

Someone else has done a version of this already as shows here- BLS :: DEFAULT VEHICLE REPLACEMENTS (BASEGAME)Pinteresthttps://www.pinterest.com › Explore › Vehicles.

I have not been able to get in touch with them to discuss the "how", but I would like t add my up-to-date and crisp/modern looking cars to my world.