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DarkTahoe had one on his tahoe, before he totaled it, that looked good with his set up. I still talk to him and can find out what brand it was if you're interested.
His was made by Lund, I don't know the model, but it looked like this one http://www.streetperformance.com/part/lund-industries/rear-air-deflector/574752-38042.html