I have never heard of a 1991 Shelby Cobra Mustang??? There wasn't even a Cobra produced in 1991. There was a 1993 cobra.
I would ask for documents relating to this "Shelby Cobra."
Let us know what you find out.
E
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1991 5.0 LX Coupe - 38,000 miles
13.17 @ 106.14 mph w/ 2.138 60'
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