Originally Posted by TurboFool
Ha, I managed to miss the wrong year, too.
And yes! The part that's pulled up in your photo is exactly what's cracked/broken on mine. I should have posted a photo, myself, to make it easier on people, but thought my description would be enough.
Sadly, our friend, while providing the wrong part, may have indeed been on the right track, looking at the teardown that 'part' seems to be part of the display assembly, it's rather hard to tell without taking apart my own device (not gonna happen), so I am going by teardown images
In short, I doubt you will find that 'ring' by itself, however, you may be able to find a cracked device (with that part intact) for cheaper than a display assembly.
The image I posted comes from a recent G+ post, perhaps you'll want to keep an eye on it, maybe someone will find something.