In fact I am in the same boat as you. I too have a 97 with missing fobs. I tried to identify the system no luck.
http://www.grandprixforums.net/how-r...sed-79647.html

I found one on ebay that has two fobs, alarm, and remote start, I gave $25 plus $12 shipping. I should get it next week and will know more after the install. For remote start you have to have a way of bypassing the theft deterrent system. They say this is an added option, we will see. When I had one add to both of my 02's they cut the transponder off of the factory key, left it in the key switch cover, from then on I just made keys from "all metal" blanks and depended on the alarm for "theft deterrent". I have not took the time to google what kind of technology 97 uses for "theft deterrent". The keys they gave me on the 97 was the "all metal" blank, so I wonder if the system before me was remote start and worked the same way. I think it was remote start, because there is a wire around one of the plug wires. If any is interested when I get my kit and learn more I can update.