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Most parts include a base, K&N filter, top plate, and studDesigned to provide more air flow to the engineDesigned for engines with round air cleaner housingsHigh air flow with excellent filtrationWashable and reusable lifetime air filterK&N Custom 66 Series 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 Filters and provide serious air flow. Each complete assembly comes with base, element, top plate and stud.