Arlam key
I know that is is not what you asked, but you might consider bypassing the alarm altogether. It was not much of a theft deterrent in the 80s, and even less of a deterrent now.
How to do it is here:
https://www.clarks-garage.com/shop-manual/elect-23.htm
How to do it is here:
https://www.clarks-garage.com/shop-manual/elect-23.htm
