In today's economy it's critical to get the most you can for your spending dollar. So there's no rationale to over pay for Brushless Fan when there are 1000's of them for sale on eBay. Plus, eBay is one of the largest and most trusted online shopping sites in the world. This site is authorized by eBay to help you find the Brushless Fan you are searching for and show them to you. If you don't see the Brushless Fan you are hunting for below. Use the search function on the right to find the variety you want.
Get out your ruler and measure. I believe that fan is 40mm square, but I can't find a depth. Also look at how it is mounted, you might be able to go thinner or deeper, depending on the mount.
A generic fan might need a bit of wiring modification for that particular 2 pin connector. 3 pin connections aren't a problem, as you only need to use the main 2 power lines - you can ignore the 3rd speed sensor wire.
Then, go shopping based on the specs (40 mm 5v fan), not the model number. Here's the quick search I put together that popped up a few potential matches. http://www.google.com/products?q=40+mm+5v+fan&hl=en&scoring=p
Just make sure the one you buy has the right specs (40mm square) and didn't pick up the 40 from a different place in the description)
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