ATC Distribution Group, Inc. v. Whatever It Takes Transmissions & Parts, Inc.
402 F.3d 700 (6th Cir. 2005)
Gears from a five-speed + reverse gearbox from the 1600 Volkswagen Golf (2009).
ATC and WIT are both manufacturers of after-market transmission parts for cars. You can see WIT's current catalog here (warning, large PDF).