Alan,
I have an OS carb adaptor for a Rossi 91. Came out of my Byron F15 with 2 Rossie 91s. I found the Rossis to be a little more powerful, but tempermental with the original carb. So, I machined up 2 adaptors to put the OS 91 carbs on. That really worked great... Also, a Rossi can take a lean run better than an OS I have been told.......
F 15 : Then one of the fans came loose and one engine blew up in flight from excessive RPM. So, am now am converting the F 15 to Turbine [big project]. I have the Byron DF leftovers from the plane. That is why I can let you have one of the adaptors. Or, a complete Rossi 91 / fan / pipe setup with a few flights.
IF it is the same monuting as a 105, you are welcome to it... ( well you experts ? ) That is also assumming UPS will ship to your location from the states? And of course you get to pay..lol
Jim