A little of topic: I'm pretty sure those Genesis used Carver drivers. I remember the Audio Critic slamming one of the Genisis models and upset that here's some ribbon drivers that cost less than $200 each in a $60,000+ ($80,000?) system. To quote: "Where's the extra $50,000? The veneer?"
As far as getting replacement: to answer your question, it may mean finding an "equivalent" driver: i.e. one of comparable quality, or better, suitable for the application and with suitable Thiel/Small parameters. You'll have to do your own work in other words. There may be no off the shelf buy-this-and-put-it-in, but if you need to keep them alive and running it could probably be done and without nearly the headache as actually designing something from the ground up.
As far as getting replacement: to answer your question, it may mean finding an "equivalent" driver: i.e. one of comparable quality, or better, suitable for the application and with suitable Thiel/Small parameters. You'll have to do your own work in other words. There may be no off the shelf buy-this-and-put-it-in, but if you need to keep them alive and running it could probably be done and without nearly the headache as actually designing something from the ground up.