GM Genuine Parts Radio Knobs are designed, engineered, and tested to rigorous standards, and are backed by General Motors. These knobs are a GM-recommended replacement for your vehicle's original components. There is a range of radio knobs for you to choose from to make sure you get the perfect fit for your vehicle's radio. GM Genuine Parts are the true OE parts installed during the production of or validated by General Motors for GM vehicles. Some GM Genuine Parts may have formerly appeared as ACDelco GM Original Equipment (OE). Indicator Markings: No