Inside my 2001 Xterra air cleaner housing there is a padded type filter that is attached at the base of the housing by lock caps. It was half chewed up by mice and was smelling inside the car, so I have removed it. I have tried looking up part number and nothing exists that I can find. Does anyone know if this needs to be replaced or not. Anyone have a part number or a suggestion? Btw, car no longer smells, thank you.