for amany parts/sensor on these cars its best to use OEM Motorcraft parts. I have used the dpfe sensor that one can get from Advance Auto and it has worked fine for me.
What one can also look out for is re-marked Motorcraft parts. I got a new vehicle speed sensor from Rockauto. I forget the brand but I figured they took a Motorcraft part and scratched out all the part information/numbers on it, reboxed it and sold it for less.