If Ferrari and Volkswagen are only two companies in world and Ferrari disallows changing Radio and Car Seat without authorization from company. I would say screw them, law should prohibit this. If you don't like the law you are free to go sale somewhere else.
If Ferrari and Volkswagen are the only two companies in the world, you just go and build a third company with a unique proposition. There's enough capital around to build a new car maker, the problem is the lack of appealing value and necessity for another clone.
