Dash Speakers
I did these 4" Kenwoods in my 66 Valiant, just made a mounting board from a chunk of plywood and secured it to the dash with plumber's tape. It's cheesy but it works and sounds good.
I just this last weekend put this pair of Infinity 3.5" in a metal template I bought from (someplace I can't remember...). As above, they look and sound good.