http://www.amazon.com/gp/product/B00A6Z0AS6/ref=oh_details_o03_s00_i00?ie=UTF8&psc=1

I had to shuffle the pins around but it's almost an exact replacement for the existing fan if you want something with the same or similar specs.

You can also make a 4-pin or 3-pin connector work.  You just need to shave off the piece of guide plastic on the connector that gets in the way.