Last of the 12 cylinder what?
The 456, 550, 575, 612 are all 12 cylinder.
I have a Fiorano (FHP) Euro 550M, which is lightyears quicker than the 512tr and 512M. If he is looking for something inbetween he may consider the fast 550s (98-99 model years, after 2000 they are much slower)
John