Generac Air Filter HSB 8kW & 11kW 2013 Evolution Series Generac 0E9371AS/OE9371A Air Filter HSB Rectangle 8kW & 11kW Post 2013 Evolution Series Can also be used with E9371 and 0E9371. Fits Generators with Generac V-Twin 410CC & 530CC engine. Will fit most Generac engines used on Generac Generators. For air-cooled Generac, Centurion, Siemens, Honeywell & Eaton Models. Authentic Generac Part.