Mounting Front Speakers

Okay I want to mount a set of 6.5 inch speakers in my 65 Barracuda. I don't want them to be seen so I was thinking on the passenger side mounting in the void next to the glove box. Any suggestions on how to mount? I am considering mounting a piece of sheet metal to the backside of the dash. The speaker would face the heater box.

How do you remove the factory speaker from the dash?