bury hands free speaker installation query

[topgolfer1]

Hi All
Have aquired a bury hands free kit,but my query is to enable me to listen to the conversation through the front speakers,how do I rig this up to my concert head unit?The iso brown block from the handsfree unit plugs into the head unit but as i have bose, lucky me,ha,ha,there is no block from the vehicle to plug into the other end.The Black power block works through the head unit,have tried,it just the speaker issue.So,Is there an iso adapter, or isnt it possible to use this feature and i need to get a seperate speaker,or quite possibly,I am being completely stupid and am missing something obvious.
Cheers guys in advance
Rich
p.s I have the old pf A8,so be gentle with me!!!!!!!