Can anyone help me find the part number for a 160 degree thermostat for a 2003 5.0. I can't find the S/N on the motor and the plate on top of the air cleaner is wore off the only numbers I can see for the S/N are 0M358 and I think 5 is the 4th digit. I've looked on the block by the starter and have had someone else look and we could not find it.