Dumb question, I went to my local dealership and bought the K&N air filter that they suggested would fit. I went home and tried it on and the opening to the filter was the same diameter as the plastic tube on the rincon, you know, the one that you place the metal basket on the inside while you place the OEM filter element on the outside. Seems like there should be another size. On the box it says rubicon, but that was what K&N suggested to my local dealer. What is wrong with this picture? Is it me????