4M5G6L721FA - Thermostat, thermostat housing OE number by FORD

FORD :   4M5G6L721FA, 4M5G-6L721-FA
  OE Number - stands for Original Equipment Number - the number of complete component or sub-assembly that was originally fitted to the vehicle. OE Number is interchangeable with the term Genuine Number

Replacement parts compatible with OE numbers