Where can I find ShellEarth2?

[PurpleGaga27 40]

Which AptUI mentions ShellEarth2? Neither the main menu, shell content, options and skirmish apt files mention that.

 

I got the main ShellEarth replaced for the main menu, and I also want the ShellEarth2 to be replacable.

[Lauren 78]

Everywhere where a spinning earth is on the top of the screen.

[PurpleGaga27 40]

I found out it's ShellContent that mentioned ShellEarth2.