Hi, arthurs. You can purchase UltraSonic Rx Isolation Pads to replace the standard UltraSonic pads. Just slide the old pads off and push the new pads onto the titanium C-rings.
The Rx pad base material is slightly tweaked from the standard UltraSonic pad and has a groove machined into the pad to hold the O-ring in place (the O-ring is made of Kalrez formula 7075).
Standard and UltraSonic Rx Isolation Pads are interchangeable, and the titanium C-ring holding them in place is the same with both versions.