doubtful that it is available,
Historically Apple has always only provided 17" Displays as the complete clamshell. and then with the introduction of the unibody and ridiculously strong industrial glues, unibody displays have also been only available as complete clamshell..
That being said, you may want to try contacting local AASP's to see if perhaps someone broke the glass on their 17" Unibody and the full clamshell sans glass is sitting in a damaged / no returnable box.
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