The part number is 5XMRX.  Do an ebay search, you should be able to get it for around $30.  FYI that your photo is not visible because you need to be logged in to the forum you linked. 
Back in April, I accidentally broke my Aurora R8's headphone port when I fell out of my chair with my headphones on. It pulled a tiny piece of plastic (which I assume holds the headphone connector in place). I tried to fit it back in, but had no such luck and since then I have lost it. See [URL] for the difference between the broken headphone port and the perfect-looking analog microphone port. Does Dell sell replacement parts for the front ports? If not, are there secondhand markets for this sort of thing?Thanks in advance.
Aurora R8, front headphone port replacement