The Mercedes Vito Viano W639 Dashboard Top Right Air Vent Defroster A6398310100 is a genuine Mercedes-Benz part made of durable black plastic. Designed for easy installation and cleaning, this Grade A dashboard trim piece is a perfect replacement for your vehicle. With the manufacturer part numbers A6398310100 and A 639 831 01 00, this air vent defroster is a reliable choice for your Mercedes-Benz.