This is some of the years and serial # range.
Serial number
HP beginning-ending year
150 5129480 - 5503246 1979 V6
150 5503247 - 5944790 1980/1981 V6 (80/81 = samma modellår)
150 5944791 - 6220253 1982 V6
150 6220254 - 6443212 1983 V6
150 6443213 - 6616990 1984 V6
150 6616991 - A904645 1985 V6
150 A904646 - A969903 1986 V6
150 A969904 - B241880 1987 V6
150 B241881 - C100860 1988 V6
150 C100861 - C221499 1989 V6
150 C221500 - D000749 1990 V6 2,0 L
150 D000750 - D081999 1991 V6 2,0 L
150 D082000 - D181999 1992 + XR6
150 D182000 - 0D284787 1993 + XR6 och EFI
150 0D284788 - 0G129221 1994 + XR6 och EFI
150 0G129222 - 0G303045 1995 + XR6 och EFI
150 0G303046 - 1996 + XR6 och EFI
1500 (150,0) 3502806 - 3752619 1973 6 cyl inline
1500 (150,0) 3752620 - 4121434 1974 6 cyl inline
1500 (150,0) 4121435 - 4319879 1975 6 cyl inline
1500 (150,0) 4319880 - 4602011 1976 6 cyl inline
1500 (150,0) 4602012 - 4868997 1977 6 cyl inline
1500 (150,0) 4868998 - 1978 6 cyl inline
1500XS (150,0) 4868648 - 1978 6 cyl inline
150 XR2 A905191 - A969903 1986 V6
150 XR2 A969904 - B289429 1987 V6
150 XR2 B289430 - 1988 V6 - sold intnl only
150 XR4 B242885 - C100860 1988 V6
150 XR4 C100861 - C221499 1989 V6
150 XR4 C221500 - D000749 1990 V6 2,0 L
150 XR4 D000750 - 1991 V6 2,0 L
150 XR6 D082000 - 1992 V6 2,0 L