New Vibrant Performance air filter.  This is the "Classic" shorty series air filter, which is a cone style filter.  This is a 4-ply cotton gauze filter that is pre-oiled, washable and reusable.  Has excellent airflow and filtration.  This has a 4.0" ID inlet, 4 3/8" overall height, 5 1/2" width at the wide base, and 5" at the cap.  This fits universal applications.