This air conditioning and heating control unit is perfect for your Mercedes-Benz W126, 560SEC, 560SEL, or 300SEL. It is a genuine OEM part number and will fit seamlessly into your car without any drilling or modifications needed for installation. With this unit, you can easily adjust the temperature of your car's air conditioning and heating system, ensuring maximum comfort while driving. It is a high-quality replacement part and will function just the original part. Buy now and enjoy the convenience of a properly functioning air conditioning and heating control unit in your Mercedes-Benz.