My air filter was full of oil from my overflow so we changed it to this one. We found this one didnt quite fit perfectly like the oem does, but just push it in where its not goimg in properly and put the top on, seemed to fjt fine with the top screwed on, and obviously a much better price point than the oem. Where the air gets through its a circular hole instead of a rectangular irregukar polygon shape but I cant see this affecting it in any way, especially as you wont even see it.