Cummins Filtration under Fleetguard filter Products line offers the widest range of replacement filters for tractors, combines, ATV and heavy duty equipment. If you are not sure about the right part # please use cross reference look up tool on Cummins Filtration site to make sure that you are ordering correct filter. Fits models: Case-IH COMBINE: 2166, Case-IH COTTON PICKER: 1800