Starter John Deere Briggs & Stratton Cub Cadet Zero Turn Riding Lawn Mowers Tillers 390838 391423 392749 AM122337 New Aftermarket Part (Not Rebuilt/Refurbished/Repurposed) Compatible with Plastic and Aluminum Flywheels Only 16 Teeth/Splines; CCW Rotation 3.75 inches long Field Case Please verify this is the right part number before ordering