Jan 3, 2019
Hello EdL! Thanks for posting and welcome to the Community.
To connect the CD20 Music Center to the left 901 speaker you would need the male 8-pin MiniDIN to male 5-pin DIN audio input cable that came with the system. We no longer have this cable available, however you may be able to find them from other sources. The Bose part number is 191494. Hope this helps!
Greg - Community Support
Thanks for the post, and welcome to the community.
We no longer offer the 901 VI for sale. We stopped offering the speakers in September of 2016.
If you have any other questions, please let us know.
Brandon - Community Support