Will Double Din fit in a 2005 Deville? I don't have factory Nav.

I'm sorry if this has been covered before but i searched for a couple of days without finding any info.

Yes it will but youll have to get a interface, and single din kit and modify it to fit a doublw din nav....
i did it.
http://www.cadillacforums.com/forums/cadillac-audio-video-security-systems/113619-help-avic-d3-install-into-02-a.html#post1162955