FREE OFFICIAL DLC

On December 19, 2005, LucasArts released the first of two downloadable packages for the Xbox version of Battlefront II. The free content added two new hero characters, Kit Fisto and Asajj Ventress, as well as four remade maps from the original Star Wars: Battlefront; Yavin 4: Arena, Bespin: Cloud City, Rhen Var Harbor and Rhen Var Citadel.

https://www.moddb.com/mods/xbox-dlc-content-for-pc/downloads/xbox-dlc-and-title-update-content-for-pc
To install download the files and put DLC_XBOX and UPDATE_XBOX in your Addon folder.