K&N Custom Round Filter 5-1/8in FLG / 9in OD x 4-1/8in HW/VENTBrand K&N Engineering Part Number 60 1120 Category Air Filters Air Filters Direct Fit Condition Brand New Original Manufacturer Packaging K&N's custom air cleaner assemblies are designed with the racer in mind. They incorporate good looks as well as the superior air flow that you expect from K&N. These custom air cleaner assemblies are designed for use with any engine that uses a round element air cleaner housing. They incorporate our famous K&N Air