This is a new ribbon cable (model KJ84-0121-12) for the KDC-MP8017 head unit. I ordered two of these from Kenwood back in the day when I still had the stereo. I used one of them to fix the stereo, and kept this one as a spare. I found the stereo manual and the extra ribbon cable today, so they are up for sale.
You will receive one original manual for the KDC-MP8017, and one NOS never opened KJ84-0121-12 ribbon cable, as pictured.