This Napa A/C Expansion Valve is a perfect fit for your Buick Centurion Estate Wagon Gran Sport. It is made of durable metal and comes with a protective sleeve. The valve has been tested for performance and does not require any drilling or modifications for installation. It is designed for bolt-on mounting and is compatible with OE/OEM part number 15-5774 and interchange part number 15-5774. This valve is not a universal fitment and is not suitable for vintage parts. It is manufactured in the United States and is a great addition to your car's air conditioning and heating system.