I found and bought a used CANBUS adapter on eBay ($129)
The seller has some more of them.
It appears to be a PCAN-USB (IPEH-002021), but the unit has no markings or labels.
I loaded the drivers from the Peak website on my Win7 laptop.
When I plug in the adapter, the software recognizes it and the red LED lights.
In the control panel, the PEAK software recognizes the adapter and shows a firmware version of 4.2
And ScooterDiag seems to connect to it, since the LED starts blinking when ScooterDiag starts up.
So far I have not connected it to my bike, but I need to get a Female-Female adapter cable.