Generic XBox 360 Audio Adapter Cable for analog audio (RCA jacks) and digital optical (S/PDIF TOSLINK) audio.
This may have been used, but it is in good condition.
This adapter cable is designed to let you use both the AV and HDMI ports on your Xbox 360 or Xbox 360 Slim console. The cable includes connectors for analog stereo audio using RCA jacks, as well as multichannel digital audio using the S/PDIF (TOSLINK) Digital Optical Audio port. Unlike the Xbox 360 audio-video cable, which has a tab that prevents use of the HDMI port, this audio-only cable does not cover the HDMI port, allowing it to be used for video, while this cable handles the audio.
Buyer pays $6 S/H in the U.S.