I found a distributor in San Diego. I can’t remember how I found him, but I did. You might try the source that you can find in the July /August edition of Absolute Sound. It shows Fidelityimports.com as the importer for Michell. If you make contact, buy more than one belt. I did. I’ll look for the phone number of the guy who I bought mine from a few years ago.
P.S. I found the info for the guy who sold me mine a few years ago. It was audio Art cable, audioartcable.com. His name is Rob Fritz, and his phone number is (619) 255-6451. Good Luck!