I guess I'll reply to myself in case anyone else stumbles across this issue looking for help. It appears the 6 pin media connector is just a USB header with only one USB port and a couple of extra pins. I attached the lower half or the USB internal connector (the side with the 5 pins) to the first 5 pins of the 6 pine "Media" header on the Z240 system board. Pin 1 on the cable connector to pin 1 on the system board.
This appears to work so far.