Please forget about the 2011 machines. Your's is a 2009. You will need to replace the top case, Apple part number 661-5244.
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Here's the part you need. The keyboard does not sell separately: http://www.ifixit.com/MacBook-Parts/MacBook-Pro-15-Inch-Unibody-Mid-2009-Upper-Case/IF161-026
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Here's the part you need. The keyboard does not sell separately: [product|IF161-026]
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Here's how to install it: http://www.ifixit.com/Guide/Installing-MacBook-Pro-15-Inch-Unibody-2-53-GHz-Mid-2009-Upper-Case/1587/1
Please forget about the 2011 machines. Your's is a 2009. You will need to replace the top case, Apple part number 661-5244.
+
Here's the part you need. The keyboard does not sell separately: http://www.ifixit.com/MacBook-Parts/MacBook-Pro-15-Inch-Unibody-Mid-2009-Upper-Case/IF161-026