I had to:
Modify the door cards (bigger hole)
Make a 6 mm. spacer
Cut a bigger hole in the metal part of the door
Space out the window guide aprox. 5-6 mm.
Cut two 45 mm. Holes in the mirror covers
It almost look stock and the sound is just so much better than the stock speakers !!
Pics will follow but just wanted you guy's to know that it is possible to fit 71,8 mm speakers in the doors of a phase 3.