Gen 1 Key fob replacement.

The plastic on my original key fobs has expired so i can't attach the little hole into a keyring anymore. What are people doing about replacement FOBs? My circuitry still works , anyone have a source for a keyfob shell that will fit it? I'd rather not have to reprogram the car to a new FOB as i've heard it requires the original factory radio (which I don't have). If I have to get new circuitry is there a FOB that can learn from an existing FOB (much like how universal remotes sometimes use your original remote to send a signal that it can learn from)?

TIA