Amazon.com: Mikuni Replacement Filter Element 3 Inch HSR 42 45 48 : Automotive
Amazon.com: Mikuni Smoothbore Intake Parts - Air Cleaner Element HS42/012 : Automotive
American Made Motorcycle Parts. forcewinder-dominator-pro-air-intake -kit-w-pro-series-filter-for-86-up-xl-sportster-w-mikuni-hsr-42 -45-48-carbs-polished-part-uf-5013-225ps