The newer style air cleaners are not like the one's from the sixties. They have the snorkles in the base and and the lid is separate. Even the singles of the seventies are the same. As far as cutting the base, it's simple, I first trimmed the drop base to fit inside the where the factory one has a slight ridge and then cut it along that ridge. Welded in the drop finished the welds off by grinding and using a bit of filler. Sanded, primed with high build primer, sanded again, painted it. By the way I saved the piece I cut out just in case I might ever want to put it back.