This 2 groove crankshaft AC pulley is a genuine OEM part from GM, designed for use in the 1971-1979 Pontiac Firebird. It has been previously used, but is in good working condition and is ready to be installed. The pulley is designed to work with accessory belts and pulleys in a variety of applications, making it a versatile addition to any car or truck. With its vintage style and sturdy construction, this pulley is a great choice for anyone looking to restore or upgrade their vehicle.