What size is the stereo head unit in a 1996 Chevy Lumina sedan?

It will be a Single Din, the mounting kit will come with a "pocket" that will go below the deck. Technically its a Din and a half radio stock (but ive only seen one Din and a half aftermarket radio). So you have hundreds of decks you can get. Alpine is great, so are the higher end Pioneers and Kenwoods.