K&N Oval Style Stacks for "Late Type" Hilborn and Other Injectors for Volkswagen Air-cooled Engines - Air filters designed to fit over stock, uncut ram tubes. Comes with removable aluminum top plate. To install, push ram tubes through rubber base and clamp at desired height. Oval top plate measures 9L x 5 1/2W, total height is 6 3/4. As with all K&N air filters, these are washable and reusable. Simply use K&N oil and cleaner to service your filter.