This could be obsolete information, but the company that manufactured that system was Code Alarm, and their phone number is (was?) 1-800-421-3209. They are (were?) located in Troy, Michigan. These were dealer installed alarm systems, and were fairly high tech at that time.
VSS 100 (economical)
- starter kill lockout
- hooks up to vehicle horn
- convenient alarm bypass switch
- Optional: 125 decibel waterproof siren, lite touch adjustable shock
- sensor, light flasher, keypad.
I hope this response is consistent with what you hear back from all the other forums you posted this question on.