A while back I read up on the subject on importing a 96-98 R33, and from memory, a few items to be replaced for NHTS compliance: mirrors- objects in mirror closer than they appear, speedometer - mph instead of kph, assorted safety stickers, of course a VIN for registration.
I woul LOVE to see how much of Motorex's price on those imported Skylines was overhead, and how much was profit.