So I contacted Ultrasone a few days ago to see if they'd be willing to sell me some parts to repair a headphone. I knew you could buy drivers from Beyerdynamic, but I've never seen a parts section on Ultrasone's site...
 
Turns out, you can buy parts from Ultrasone. Even drivers! Specifically Edition 8 drivers. So if you guys have broken drivers in your Ultrasones, you can actually email gene.andre@musicaldistributors.com and do a driver swap!
 
Just ordered the ED8 driver. Gene is very helpful and will let you know how to complete a task when you order the part.