Ball Mount
The screen accurate ball mount was manufactured by Radio Shack but is discontinued. It included the ball as well as the grey base and mounting hardware. You can purchase a ball mount from Right Channel Radios and other sources and simply paint it grey, but keep in mind that the Radio Shack version is slightly smaller. Therefore, if you go with a non-screen accurate base, it may be difficult to mount the Radio Shack one if you ever decide you want to go that route.