1) Standard equipment was a buzzer for key-in-ignition while driver's door open.
2) Optional equipment was a chime for key-in-ignition while driver's door open, seat belt not fastened, and headlamps on reminder. The chime count is different depending on which of these factors are met.
1)The buzzer alarm has six terminals
2)The chime alarm has seven terminals.
These parts are interchangable without any modification.