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I just ordered a 4 point from East Coast Vettes. It is made by Pfadt and is powdercoated the color of your choice. I shopped around, and they seemed to have the best price. They have a good web site, with a lot of great products. I came across them about 2 months ago.
SW Racing also has roll bars, but they come disassembled and often not notched, and need a lot of fabrication. Since I didn't want to be welding in the car, I went with the Pfadt one which is a bolt in with welding optional (I will end up welding the base plates).
I suggest you contact Doug Rippie Motorsports...an excellent forum vendor with racing experience. Also, you might checkout Livermore Performance as well....they have a good selection of roll bars/cages for the Corvette.