From wiring diagrams:
1988 - Intergral Alternator & Regulator
1989 - Intergral Alternator & Regulator
1990 - Intergral Alternator & Regulator
1991 - Voltage Regulator & Alternator are 2 units (external regulator)
1992 - Intergral Alternator & Regulator
1993 - Intergral Alternator & Regulator