This is a new knob for GM Delco navigation radios from @2003-2007. See the last few pictures in the ad for examples of radios it can be used on. It can be used for either the Volume or the Tune. (Although it might not match your existing knob exactly, if you are just missing one. So you might want to purchase two in that case.) This is dark gray in color. They did make another version that was a little more black so, again, if your radio is supposed to have two knobs and you are only missing one, you might want to consider getting two of these. This is brand new and has never been in a vehicle. It came from a remanufacturing center that was getting rid of inventory. Please do not purchase from this listing and ask for something different. We cannot accommodate substitution requests. This is for the knob only. (One pic also shows a dime. That is just for size reference. You are not getting a dime too...)