I will assume that hte fan in question is for a DS10?
I have not yet found any replacement that will work. Most won't fit onto the heatsink properly. I refuse to spend $100 for a fan that should cost less than $10. I was able to acquire another unit with multiple spare parts rather than spend rediculous money for just a fan. I might suggest the same for you. DS10s are available for short money on Ebay. BTW: In the last 10 years with 6 DS10s in production, only 1 has failed and that was due to a bad fan. Not a bad track record...
The fan on my DS10 was pretty noisy when I acquired it. The bolt pattern on mine is the same as a standard 80 mm fan, though the OE fan was thinner than any I had on hand.
I replaced it with a random fan from my spare parts collection, a Datech DB9733-12HHBTL. It sucks air up through the heat sink and exhausts it out the back of the case. I had to switch the wire positions on the plug and trim the exhaust end of the shroud but it works very well and is surprisingly quiet.