Why can't the Solo be imported?
They probably didn't bother going through all the hoops to prove that it meets all of the required standards. As the rest are similar, they may have qualified them as a group
The Ural is a perfect bike to revin with a 15 year old vin and import (hell, it may actually be identical to one made 15 years ago). The big problem then would be insurance (and the fact that it is illegal).