Most of the stateside Aero 8s came into the US in 2005. Then there were a number (I have heard of 6-8?) of the 2008 'Aero America' cars that came in. Then there were a few of the Super Sports and Coupes under waivers. I have never seen a Max in the US, but understand some (around 12 or so, I believe) did come in. The new Aero is not coming, with no waivers in sight.
Trads are illegal as well, with the last being the 82 (As I understand it, only 82 airbags were certified for the US . . .) S1 3.0l Roadsters. The only legal Morgan in the US at the moment is the M3W.
Cheers,