I seriously think FSX is missing two classics
The Stoof (Tracker)
http://www.airliners.net/photo/KLM---Royal/Grumman-US-2N-Tracker/1424045/L/&sid=b3be0244c26516605091772aafaa349b
and the stoof with a roof (Tracer)
http://www.airliners.net/photo/USA---Navy/Grumman-E-1B-Tracer/0571410/L/&sid=b5e79fdc62b43db0c8af5c43921a2cb1