Hi, the lower hose you have selected is designed to fit the 5.7L engine only. For the 6.4L engine, Dodge is indicating that the correct part is 5039042AG, found at this link here: https://www.carid.com/dodge-oe/lower-radiator-coolant-hose-mpn-5039042ag.html. We checked with Dodge, and the understanding is that all cars with the 6.4L engine used the lower radiator hose with the oil cooler outlet hose.