The corresponding part numbers are 2045012582 and A2045012582; these are radiator coolant hoses. These hoses are suitable for W204, W207, and W212 and are part of the cooling system piping assembly. They connect the radiator to the relevant interfaces on the engine, delivering coolant. They accommodate coolant flow, promoting exchange within the cooling system. They adapt to the engine compartment environment, maintaining a stable coolant supply.