Arlen Ness AN-18-803 Stage 1 Big Sucker Air Cleaner Kit Natural for Sportster 88-21 w/EFI or CV Carburettor Requires Round Air Cleaner CoverDescription for Arlen Ness Stage I Natural Big Sucker Performance Air Filter without Cover 18 803 Using one of these kits eliminates the need for banjo fittings, hoses and filter Each kit features a one piece billet backing plate carb support bracket and all necessary hardware and instructions Accepts 8 in. round after market covers only Breather passages exit at the mouth of the carburetor, creating a virtually closed loop system NOTE: Will fit 88 90