eBay
Atari Video Music knob cover. This doesn't include the knob itself just the aluminum cover.  This is a replacement for the Atari Video music. You will need the black plastic insert to go under the knob cover, which is not included. This knob cover is scratched up, and the black dot on the knob cover has faded off. The scratches were not picked up clearly on my camera, but they are there.

This listing only includes the 1 knob cover as seen in the pictures. You will need the black plastic insert to go under the knob cover, which is not included