I fit mine close to the hood and use a rubber seal that slides right over the top edge of the air box. Get the seal from an autobody supply company, and a good rep with a big catalog!!!!!!! Lots of good choices if you get your hands on one of their catalogs.... Or, Lowe's, Menard's, etc. is a heck of a good source for such things....Check out the heating and plumbing departments.