I'm pretty sure it's a Shark Attack 2 Antenna, here's a link, a ton of people here use it:
http://www.locustom.com/shark2_kit.htm
What I did was just remove the antenna as a whole, and plug it up with the OEM 25mm Grommet since I have an AUX input on my headunit and always have my iPod with me
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It's Part # 82871-671-000 for the OEM grommet in case you wanna go with that. If you still really want an antenna, there's quite a few "under the dash" antennas you can get for around the same price as the Shark Attack 2. Here's a pic of my teggy with the grommet:
Sorry it's not the best picture, if you want me to get some better ones let me know!
And sorry for thread jacking, OP. Your body work looks good, way better than what I did. I effectively made something that didn't look so bad into something that looks terrible :/ I should have just left it alone.