Dell Optiplex GX280 Small Mini Tower - Fan Replacement

I need to replace the fan in a Dell Optiplex GX280 SMT.  What fan size do I need to buy?  

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which fan?
cpu - case - power supply?
Dr. KlahnPrincipal Software EngineerCommented:
Assuming that we're talking about the cooling fan built into the power supply, and not the fan sitting on top of the CPU -- looking in my GX280, it is a non-standard squirrel-cage blower.  I found that removal and partial disassembly of the power supply is required to work on this fan, and it is somewhat difficult to get back together properly.  A good place to look for this part would be on ebay.

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