Here is a WINDOW REGULATOR GEAR REPAIR PLATE for your 55-57 Chevy 2 or 4 door sedans, 2 or 4 door wagons & Nomads. The plate will do the front regulators, either side. If the teeth are worn or chipped on your gear plate you'll notice the strain and slipping when rolling up the window. You don't have to tolerate it! This part is easily replaced when overhauling the window assembly.