What were the differences in dash speakers?

The dash frame out of the 72 scamp was 11 7/16 right on the nose. That was center of the screw to center of the other screw. Hope this helps.
The 72 now has a dash out of a 73 or 74 dart, I havent installed the stereo yet so next time I am out there I will try to get that one for ya too.