The common carb used on these bikes is the PZ30. It takes a 42mm air filter on it's intake opening. I've heard the 41mm will also work. So that's probably what you need... but I would measure your carb opening... and convert to millimeters and search ebay for filters.
My carb intake to the engine is solid. It's metal with a rubber/plastic coating and bolted to the engine with two bolts... and two bolts for the carb to mount to the intake. I would have no worries about extra support for the carb using a clamp-on type air filter (instead of the stock airbox).
Cheers!
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