The front sensors have the same part numbers for the 4.6 and 5.4 Liter 2WD, left front sensor is XL3Z2C205AC, right front is XL3Z2C0204BC, The rear only uses one sensor mounted in the differential. Remove it clean it and put it back in and see if the ABS light goes out. Often debris gets on the sensor because it is a magnetic type sensor. I don't have a number fro that sensor but it quite cheap and fails often. Try www.rockauto.com.