found this on wikipedia
Production numbers In the United States
All models (including convertibles):
1989 - 68118
1990 - 60582
1991 - 34534
1992 - 27033
1993 - 21471
1994 - 1391
1995 - 25114
1996 - 7334
1997 - 3655
1998 - 1232
Total cars produced from 1989 to 1998: 251410
Nissan 240SX - Wikipedia, the free encyclopedia
not sure how accurate this is though
i guess im lucky to get one of the factory manual trans. 98 s14
