When I pulled the build sheet from the front left fender of my '67 Wildcat Custom Convertible, as expected, it matched the details of the car. When I removed the gas tank to have it redone, the build sheet on top of the tank was one production number higher. It was for a '67 four door sedan thin-pillar Wildcat, not my convertible. Someone must have been sleeping on the job! Has anyone else run across a build-sheet mix-up like this?