Really tough to find. I might consider trading one, but I would only be willing to trade for other 110/111/111S or Stihl 1106 (Contra, 090). Pm if you have any spares.
Sorry only have the one and it was heavily modified to use in competition. But if you happen across another muffler in your dealings would appreciate any opportunity you might give us to purchase it from you.
Thanks
David