Replacement Mac Pro fan

im noticing pcie fan on mac pro sounding loud , annoying me. since pcie fan assembly user serviceable according apple's manuals i'm thinking of replacing myself instead of taking 200km nearest apple approved tech. i'm wondering if need whole assembly or fan , source of is?

 

have cleaned out dust? did google search , found this. http://www.google.com/products/cata...l7t7_2hmsyiakpz-0v&ved=0cgoq8wiwaa#ps-sellers

 

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