that's pretty dificult to say
if you look in the 360's case, the Modena was intruduced in 1999 and now it's 2004 and there is a replacement
the 550 was build from 1996 till 2001
replacement started in 2002
the 456 (GT/GTA/MGT/MGTA) saw production from 1992 till 2003 and now there is the 612
if you look in the 360's case, the Modena was intruduced in 1999 and now it's 2004 and there is a replacement
the 550 was build from 1996 till 2001
replacement started in 2002
the 456 (GT/GTA/MGT/MGTA) saw production from 1992 till 2003 and now there is the 612