1965 Barracuda rear defogger

Not trying to hy-jack this post... but if anyone has any information on a rear defroster set up - pictures please for the rear of a early Barracuda... That would be really cool.
My car is apart on the rotisserie and it kills me to see the cuts in the back and no option to fill it.
I thought the holes in the back on the passenger side was for a rear speaker but a rear defroster make sense. I wonder if it is the same as the 67-76 a bodies?
Great post RJG!