Fortunately, you have the faceplate. The options are to find a 2-shaft radio like whats in there, or carefully cut that faceplate to have a DIN opening.
What I see missing are the two 2-piece clamps that hold the upside-down-U-shaped support rod to the handlebars.
If you do a Google image search for "nighthawk rooster" the pictures with the separate tweeters are of my bike, before I put on the Windjammer.