2002 e53 X5 4.4i with DSP and no CD player.

I ordered the Mediabridge 1500 and the DSP kit. When I opened up the left rear of the cargo compartment I found the three pin connector but could not find a six pin connector or coax. There is a coax input on the amp but no cable in it.

Can I just buy one and connect the DSP adapter to the amp?