Cd Changer

Hi There, I Am Considering Buying A Factory Cd Changer For My 406 Lx There Is A Spare Socket In The Back Of The Head Unit My Model Year Is 2000 X The Changer Is Out Of An S Reg 406 Coupe Does Anybody Know If The Changer Will Simply Plug Into The Current Head Unit? This Is A Single Cd Head Unit Any Help Would Be Much Appreciated