Decals, Series rewards


One thing that might be viable is Stickers for the vehicles. Like a unique one for each series(Amt~Pro). Possibly one for a record. But even just common pictures, graphics, random fake company decals. There could be an entire display case of them in the defunct market. That can either be bought with fame or credits.
These wouldn't replace livery, or style, but can give players a way to individualize.