Part No: 3 397 016 370 / AR13U. Wiper Style: Aerotwin Retrofit. Quantity Included: 2 Wiper Blades. 1 2 3 4 5 6 7 8 9 10 11 12. Key Points. Silent operation on both wet and semi-dry windscreens. They will guide you through the warranty claim process and provide the necessary assistance.