This Pontiac stereo unit knob is a must-have for any vintage car collector. Made of chromed plastic, it adds a touch of silver elegance to your car's interior. The knob is designed for tone adjustment and fits perfectly with 1970-1972 Grand Prix GTO models. Its manufacturer part number is 9788018 and it was made in the United States. Please note that this item is being sold as used and has no warranty. It is a great addition for those seeking to restore their classic car, and can be found under the Radios for Parts and In-Car Technology, GPS Security categories Motors. Get your hands on this unique piece and upgrade your car's audio system with a touch of vintage style. Exact item is shown. Chrome finish has some wear around the edges. In good used condition. Outer diameter is 1.5 inches. Made in the USA. Please review our business policies in our store for information regarding returns, shipping and warranties. Last chance at this.