Invoice for AC Cobra Chassis #CSX2451, from Shelby American, Inc. to Virgil Exner, Inc., 1964

Carroll Shelby took the auto enthusiast world by storm when he pulled the straight-6 engine from a lightweight British AC Ace roadster, replaced it with a Ford V-8, and created the Shelby Cobra. Chassis number CSX2451 was sold to former Chrysler design head Virgil Exner. It became the basis for Exner's Mercer-Cobra concept car, built in collaboration with the Copper Development Association.