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Here is a brand new genuine nissan water pump with gasket for the sr20ve for $40 plus shipping from courtesy parts.
http://www.courtesyparts.com/Merchant2/merchant.mvc?Screen=PROD&Store_Code=CP&Product_Code=21010-SR20VE
http://www.courtesyparts.com/Merchant2/merchant.mvc?Screen=PROD&Store_Code=CP&Product_Code=21010-SR20VE