The Cummins ISM Diesel Oxidation Catalyst is designed for new OEM numbers 4936736NX, 496919nX, and 5287519NX. Made with silicon carbide substrate material and stainless steel canister material, this kit includes 1 diesel oxidation catalyst, 2 gaskets, and 2 clamps, sold individually. Not CARB compliant and not for sale in California, it fits most Cummins ISM models and is compatible with OEM and aftermarket numbers: 4936736NJX, 4969719NX, 5287519NX, D-CEXH-MN0401, DCEXHMN0401, 2606987C91, A35H544, C0017-ID, and C20-0017.