The belt is the strap going around the muffler (one at each end) that is held on with 7 pop rivets.
I've called Akrapovic USA but they wont help me because I'm not a dealer. I've called several dealers for help. They all tell me they cannot (or wont try to) find any information on the belts.
It appears the only way to purchase one of these belts is to purchase an exhaust sleeve rebuild kit.
Anybody have a hook up for the information?