forged axles

I need help selecting forged axles for and '03 GT with a 31 spline diff.
I see that FRPP, strange, moser and superior all make forged 31 spline axels for my car. Whats the difference between each, I've also noticed that the prices are all almost equal from lookin at various venders, all are around $250.
I've also noticed slight (small) differences in axle length depending on the manufacter, what is the exact length for my application? I would hate to have the bearings and abs sensors pressed on the axels only to find out the axel won't fit when I go to put them in.
 
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