Main Alarm Unit:
1978 - 1983 - 928.618.117.00 (behind glove box?) Covered 83 as well
1984 - 1988 - 928.637.104.00 (behind glove box?) Covered 88 up to 92JS861398
1988 - 928 637 104 02 from 92JS861399
1989 - 1990 - 928.637.104.05 (behind glove box?)
1991 - 928.618.260.00 & 928 618 260 01 - both SS to 928 618 260 03 (beneath RHS seat)
1992 - 1995 - 928.618.260.03 (beneath RHS seat)

Secondary Alarm Unit: Relay
1989-1995 - 928.637.160.00 - In console - covered through 95

Alarm Fog light Flasher:
1988 - 1990 only 944.615.113.00/01 both SS to 944 615 113 02 - In console

Alan / Roger

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928.637.160.00 is the optional relay for the alarm (light flasher: Fogs/Stop only)