95 Cirrus Alarm Help

I just bought this car used. We lost the remote before we could get another. It controled the alarm and keyless entry. I would like to know how I would find out what kind of alarm I have so I can get a replacement. I can't drive it to a shop because the car won't stay started for longer than 5 seconds. I can't find a cut off switch. I pulled out the fuses for the horn and the lights. Everywhere I called wants to know what kind it is. I believe it is after market since there is an alarm company sign and the day it was installed. The company is no longer in business.

driverside door cyl lock try holding in unlock position for 5 seconds, may disarm.