Cx7 head unit wiring issues !

Hey there guys looking for help my 2007 cx7 with bose Soundsystem I'm trying to hook up another head unit but I'm missing a plug for the headunit... New one needs 2 mine only had 1... The one that's in it is a 16 pin plug as well... Unsure what wires are my speaker wires... I've got it to power up and all the goodness just can't fine my speaker wires...