Guys, The so called air filters that cross over should not be used. They are not right. If they were we would use them. We tried all of them 3 years ago & used to say that they were close they were & with modification & adds they could work. We rebuild & RR alot of engines now that were using them. USE original types or totally replace with a KN. Be careful these engines are vacum systems dependent & will run funny if not right. Use a OEM typ replacement, keep the cannister in place & clean regulary. Blow out the filter all the time. They will last for a long time.