They would likely have to be modified to meet new safety, emissions, anti theft, etc standards to be able to sell them in the US... In other words, it would be

They would likely have to be modified to meet new safety, emissions, anti theft, etc standards to be able to sell them in the US... In other words, it would be a completely new car. Even old designs with a new date of manufacture have to meet these new requirements. Not to mention that insurance will have a say about the ongoing costs of such a car. Some of the cheapest cars on a basic search to insure are SUVs or Crossovers.