damit..I knew I shouldn't go to autozone..The guy took the filter to the back and supposedly measured it..and told me what to get from one of the aisles..well..it fits on a 3'' thing..but the adapter for the old one is smaller..I think it's 2.5 idk though cus I can't find something to measure it with..so..now I need to order something off the internet because no store here even carries one under 3'' or the adapter..damit.