Thanks everyone! I concur guys... this should be a factory Nissan item. The rear just does not look complete (IMHO)without it.
It was purchased off of eBay from Spoiler Solutions.
Spoiler Solutions.com Just under $325 shipped.
I sent them an email before I purchased and asked a few questions. The were great to work with and it was on my doorstep inside a week. I can not say enough about the quality of this item! Paint, fit, in installation were right on. The installation instructions were a bit vauge (and no cartoons). If you you can't figure out what you need to be doing, you probably shouldn't be drilling holes in your car...you should have it done by someone that can.
My schedule is really tight right now but I will try and get a D.I.Y. post together in the next couple of weeks.
As a side note. I got my custom car cover yesterday and it fits over the stubby antenna and the wing perfectly. Fits like a tight lycra dress on a tighter a....well, you know!
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'10 ZR Black Cherry Sport/Touring/Nav, Swift Springs, Stillen G3s, 15mm-F 20mm-R Spacers, SPC, Spoiler Solutions Rear Wing, Stubby Antenna