20" iMac (Mid 2007) CPU Blower Fan

I Ned to replace a failing fan. What is the apple part number?

Hello,
PN:922-8201,620-63913 FOR 20" iMac Mid 2007...
http://www.ebay.com/itm/NEW-CPU-Blower-Fan-PN-922-8201-620-63913-20-iMac-Mid-200 7-/120912605992
http://www.welovemacs.com/9228201.html

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