Bose stereo replacement
I'm new to this forum but have owned Alfa's for years,most recently having a spider but having replaced it with 156 JTD Lusso for my newly expanding family. The car is kitted out with the Bose speaker system but previous owner(s) seemed to have removed the original head unit and replaced it with a Sony remote control single CD unit that is no longer operable by the steering wheel controls. Can anyone assist me with what should be there so I can get the Bose system and steering wheel controls up and running properly. Should there also be an amp fitted with this system?