This is a new knob for an unknown GM radio. Perhaps a Buick radio, but we are unsure. If you think it will work for you and are willing to take a chance, this listing is for you. It is brand new and has never been on a radio. The metal insert may show a slight amount of rust from sitting in storage for years but you don't see the back side of the knob and it doesn't affect use of the part. The picture shows two knobs only so you can see a front and back view. You are only receiving ONE knob. The picture shows a dime and a quarter for size reference only. You are not receiving 35 cents with your order. As you can see, this knob is slightly larger than a quarter. It is for a D shaped shaft. There are no returns on this item. The price is such that you can afford to take a chance on it.