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My brother in law bought a new frame for his 61 from them, he was very pleased with the quality and had no fitment problems in changing out the original to the new frame.
I believe Vette Products of Michigan is the only one producing new "original type" frames at this time, so whoever you by from it probably came from From Vette Products.
Mine is in powder coat now. I compared it to an original I have. I saw a few minor areas that seemed to be not quite as smooth as the original, but the original may have been the exception. Over all, I am very pleased.
Neal has all of the original GM dies to stamp the parts, and makes 28 different GM-licensed versions of C1/C2/C3 frames; he's the ONLY source of correct reproduction Corvette frames.