K&N Custom 66 Series Assemblies, 4" High by 14" Round, Dropped Base, (66-5090)
K&N Custom 66 Series custom air cleaner assemblies are designed for use with any engine that uses a round element air cleaner housing. K&N Air Filters provide serious air flow. Each complete assembly comes with base, element, top plate and stud.
Billet Aluminum Spoked Lid Assemblies
Part 66-5090 Product Specifications
See here for more info: http://knfilters.com/racing/custom66.htm