I wanted to chime in with an update. It took me several hours 2 confidently put my thumb on the correct part. Fairchild semiconductor was purchased by ON semiconductor and the part number is slightly different now.
As of May 2018, What you need are 5 pieces of 60 volt 20 amp surface mount mosfet, part number HUFA76429D3ST_F085 per throttle actuator board. I sourced mine from
www.digikey.com