I'm looking for a new head unit for my Cadillac because the tape deck is not going to cut it. Will any other model Cadillac with a CD player head unit be able to fit in the 1990 Deville? Because I don't want to really go after market. I want to make the car look original as possible. Because after looking around the Deville didn't even come with a CD player option until 1997 and that head unit looks to new/modern. So would it be possible for a Fleetwood's CD player be able to fit in?