I have been looking for a while for the plugs that would have been used to for the CD changer in my Z4's trunk. I have seen photos where the amp is mounted to the forward wall of the trunk (behind the seats) and the cables are tucked in a small hole near in that wall. My amp in mounted down behind the battery and I can't find loose cables anywhere.

Did all Z4's come wired for CD changers?
Is there telltale wiring in the back of the stereo that would let me know whether my car has the CD changer wiring or not?
Are there any other hiding places for CD changer wiring?

Thanks!