70 Duster rear speaker size?

Hi All,

@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!!

Thanks FABO!