K&N Engineering Universal Air Filter Chrome Round Tapered Red - 4in Flange ID x 1.125in Flange Length x 5.5in H - RG-1001RD

K&N adjustable fitting Universal Air Filters are made with flange inserts which adjust the filter's flange to one of three inside flange diameters. The flange on these filters is made with ultra-strong molded pliable rubber which absorbs vibration and allows for secure attachment. K&N clamp-on universal air filters are washable and reusable.