@roccodart440, are the Alpines a direct fit? I am getting ready to do an install as well (also a '70 Duster) and am going to have to cut the holes, etc. for them into a new package tray from Year One / R.E.M. (came with the car when I bought it). I just upgraded my '96 Caprice and used the JVC CS-DR6930 and have been happy with them, and was hoping to use the same speakers in the Duster (but unknown fitment). Any guidance is appreciated!!
I used kicker 6x9s in the rear. I had to bolt them from the botto side in the trunk so theu would fit under the package tray. My new package tray had holes in it for dual speakers.
I bought a bracket from a member on here a few years back. It mounts two 4 or 4.5 inch speakers in the factoy location in the dash. Used kicker speakers all around powered by a retrosound radio. It's good enough for me
In my 74 duster I had a full set of Polk audio speakers two 6x9s and two 6 1/2s with a clarion stereo. With a poll 12 sub. Man that car had some amazing bump and clarity.
I used alpine type-s for my rear speakers, (used alpines for many cars). I have my blown speaker from the front and planned on making a bracket myself to fit two smaller speakers but haven't gotten around to it yet.