Spectre Performance HPR9617 Universal Clamp-On Air Filter: Round Tapered; 4 in (102 mm) Flange ID; 6.75 in (171 mm) Height; 6.813 in (173 mm) Base; 4.719 in (120 mm) Top Engineered for increased flow and greater performance Factory pre-oiled and ready to use Quality materials used throughout including washable synthetic filter media, urethane, and steel mesh Clamp-on Style Air Filter Use P/N HPR4820 Accucharge kit to clean and re-oil the filter