or some other shop that specializes in federalizing nonUS spec cars. It takes a lot more than just paperwork. It's not cheap, it's not easy and it's not even fun. it was until about 1985. These days, it's generally not worth the effort if there is a US version of the car.
If you know how to get around this situation, check ebay. You can usually find a car stuck in customs waiting for the crusher. I heard there was a late model S600 going for less than $30K because it didn't have the right paperwork and had to be destroyed.