This little round K&N air filter slips inside your crankcase vent tube with it's 5/8" metal tube, on your bevel drive twin. The end is rubber so that it will not scratch up expensive bodywork etc, it is around 1.75" diameter and 1.4" tall. A nice little unit, I run these tucked up under the seat sitting against the frame and fender out of the way and out of sight.
NOTE: K&N filters now come pre oiled so the little tube of red oil is no longer included with the filter..
