Only 96,000 and change '66 GTO's produced, and that was the most prolific year. Fender liners were not popular at all at the time (people buying these cars did not want "extra weight" to slow them down) and they were a sales flop. That said, they sure look "cool" today on a '66 or '67 GTO....No way to get a percentage, though. Nobody kept track.
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Jeff 
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