Stock Radio connectors question

I was thinking of buying this and installing this

http://caraudiosecurity.com/usb-integration-for-bmw-models-with-head-unit-with-quadlock-conn-16911

However when checking behind the radio i noticed a free slot on the right hand side next to the cd plug looks similar but connectors reversed.
http://s25.photobucket.com/user/roh92cp/media/stereo004.jpg.html

Now i know they say that media boxes plug into the cd port so you loose cd and then have media box but is there a way to connect the box to the free slot and still retain cd player ?
 
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