Custom Air Cleaner Assembly. Designed to fit Harley-Davidson motorcycles equipped with various carburetors. These air cleaners mount directly to the carburetor flange. Increase horsepower with proper carburetor calibration. Made in the USA. 36mm-38mm Mikuni air filter; 5 diameter open round style. We will accept your request at our earliest opportunity. This includes Republic Of Ireland. Please do not ask us to lower the value of goods this is illegal and we do not want to get involved in this kind of activity.