I did a little research, and Onan generators take a filter exactly like Fram PH4967, except it is a 4.75" long. It has the same gasket seal, thread size and pitch, and internal parts. The only filter brands that make one though are Baldwin, Fleetgard, and WIX. All the other filters you guys listed will probably work, but in order to get an exact replica, you need to go with a Baldwin B7238, a Fleetgard LF16165, or a WIX 57398.