Cooling fan problem

[BordeauxComet]

One of my cooling fans (the 4 bladed one on the passenger side) is bent, so when it spins it kind of wobbles. Actually, it wobbles quite a bit because it causes the whole car to vibrate. I took it off and tried to fix it, but I couldn't completely get the vibrations to stop, so I'm going to replace it. I checked SubaruParts.com and all I can seem to find is the 5 bladed one. Does anyone know where I can find the 4 bladed fan, or if the 5 bladed one would work? I only want the plastic fan, not the motor assembly it attaches to. Thanks,
-Nathan