iMac screen cracked, Is it possible to replace just the glass cover?

My cat knocked my 2009 21.5" iMac off my desk. The glass shattered, and one corner got knocked in a bit. Otherwise, it works fine- I'm typing this on it, through the cracked glass.

Is it possible to replace just the glass cover? The screen works just fine. Ebay has "glass front screen panel" for about $40, which seems to be what I need.

Thanks for any advice.

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