I lost one of my keys and the remote-opener for my 99 9-5, the one with a separate key and remote-opener. I had seen the single key/remote for the
2001 model year and wondered if it would work with my older car.
I bought one on eBay, had it cut to work with my car and then programmed at the dealer. All is well.
AND I no longer have to have the keyfob with the key, just the single key.
dunno if anyone else had tried this, but it was an experiment for me that worked out well.