Oh, the reason is because in the stock spot is my cassette player.The other head unit is for CD's. It came out of a Ford Explorer.The CD player plugs into back of the cassette player, so I can play tapes & CD's.I kind of thought that was too much considering 1 it's dirty as hell. I'd be better off getting new.I also figured even if I get a new one & decide to do away w/ the lighter,cup holder etc I could have someone relocate my lighter.