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I used 3" adaptors all around. The rears hang out a little bit, but
going to 2 3/4" will require me to move the Ebrake bracket to the
top of the trailing arm. Also, rear spring and/or sway bar may start to
interfere with less than 3" adaptor. I bought mine on Ebay ... $90 a pair.
The link to the auction is in my post below. These are stock C5 thin spokes:
17x8.5 front and 18x9.5 rear.
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.