The CK7-W is a good blutooth kit, have fitted lots of these and not had many problems with them, the only real fault with them is the buttons tend to break sometime is you are to rough with them!
In steves pictures above the middle one he reckons is microphone is actually the speaker plug, it takes the sound from the control box to the speakers, the speaker plug if fatter than the mic one anyway so im sure you will work it out easily enough!
Also the ck7-w will have a smaller black plug that goes into the control box, you will have to cut the white plug of yours and join the matching colours together, just remember not to snip all the wires at once and short them out!
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