I was wondering if anyone knows the stock speaker size that goes in the dash on a 1975 Pinto specifically(without air conditioning if it matters) or any years in general. I saw that Auto Custom Sound makes a very nice dual voice coil speaker that gives you stereo sound where there was only a mono oval speaker originally. It's a nice high wattage upgrade but they don't show a Pinto application in their catalog. I'm betting the Mustang II speaker is the very same one but I need to know for sure.
-John

Thanks! That helps a lot. The plan is for 6x9 boxes in the back hatch area(so I don't have to cut out the virgin panels) and the stereo Auto Custom Sound DVC speaker up front.

The Auto Custom Sound DVC speaker #3005DVC is 5x7 and is made for single speaker dashes in the Mustang II. What's nice about it is it gives you stereo sound and pretty high power handling-140 watts(probably peak). There's no DVC 6x9 and I wonder if it would even fit under the dash but good idea since bigger is always better in full range speakers. If I had a car with dual 5x7s in it I would definitely opt for those adapters to go up to 6x9s.

O'Reilly's, and maybe autozone to, sell an adapter that will let you install 6x9 speaker on a 5x7 mount!

Oreillys sells nothing fore stereos