We buy American, and use American Made parts for all of our exclusive Cliff's Carburetor parts and kits.
Nothing "special" required. We have folks using our new parts in E-85, so they should be fine for methanol.The calibration would need to be changed for the type of fuel. For E-85 it takes nearly 30 percent more to do the same thing as gasoline. Not sure about Methanol, as I've never set up a carb for it.....Cliff