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The extended battery sort of fits. The back cover will not completely close, but it will probably close enough. That said, I really think that you are better off getting the proper back for the extended battery. It may be that the tighter space will cause the battery pack to not shed heat the way it is supposed to, which will be worse for battery life.
Still, try it with the stock back and see how it goes...
I just recently tried to buy a BF6X battery on amazon and 2 defective batteries later I had to just give up and get a refund. No problems with the refund but I was pretty disappointed that two batteries that appeared to be official Moto batteries were clearly junk. I have one BF6X and it works well so I'm just going to bite the bullet and pay full price for one from VZW.
There are some BF6x batteries on Amazon that are cheap, but I suspect that they are all used. The ones that sell for about $40 with the battery door are probably the only ones worth buying from Amazon at this point, almost two years after the D3 came out.