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I think the usual one series 19 row Setrab fan pack would be fine. But, I actually run the twin fan, 20 row, 9 series cooler. It is not that much more expensive and is more than enough to keep the diff cool.
http://www.setrabusa.com/products/fanpacks/fp920m22i/index.html
http://www.setrabusa.com/products/fanpacks/fp920m22i/index.html