K&N Individual Round Style Stacks for Kinsler Non-Siamesed Fuel Injector Stacks - Round filters fit uncut ram tube bells and clamp securely to the lip. Will fit any injection setup that has a minimum of 4 1/4" center to center, and parallel ram tubes. Each filter has a rubber top with a stamped K&N logo. As with all K&N air filters, these are washable and reusable. Simply use K&N oil and cleaner to service your filter.