There's only two--one that feeds into the PCM (the PCM controls the fan) and the one for the gauge.
See this listing:
http://www.smpcorp.com/catalog/catalog1.asp?SEL=FORDTSU&maker=FORD&prod=&sel1=1 Your local NAPA or Carquest should be able to cross that SMP number. (A "temperature sending unit" is for the gauges, a "coolant temperature sensor" is for the PCM)
Brian
