Fuel Injector 5263321 compatible for Cummins Engine ISBE ISB QSB ISBE4 DAF Truck CF LFFuel Injector 5263321 for Cummins Engine ISBE ISB QSB ISBE4 DAF Truck CF LF Note: The 100% Genuine part doesn't offer any warranty, return or exchange service. Please confirm according to the correct part number instead of just a model! For the new part ,we advise you replace the whole set together, Because the oil output and atomization concentration of Genuine and parts are different, they cannot be mixed to work for the same engine. Replace Part