If they are anything like Chevelle pieces, you have to draw everything into place. I sold a new set to a friend several years ago. They didn't appear to be close to the shape of the '68 Chevelle bumper, but they tightened down and fit fine. All bets are off on fitting an aftermarket bumper.
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Chevelleless after 46 years......but we did find a low mileage, six speed, silver 2005 Corvette. It will just have to do for now.
