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It seems to me that they are the smaller hole size. Look at the inside and see if the "fingers" are 1/8 or 1/4 inch from the edge. I think I have a few extras of the later style, $30 for a set of good ones.
Designer Imagines A Corvette That Looks More Like a Corvette Than the Corvette
Slideshow: A Jaguar designer's personal project imagines what a modern front-engined Corvette might look like if Chevrolet revisited the golden age of the Stingray.