I have removed the plastic grille above the instruments expecting to find an open space for speaker install however it is covered over with part of the dash moulding. It seems to be just thin card type material, therefore I am assuming that this would just need to be cut out to accept the speaker (the recessed area looks to be shaped for a speaker) ?. I was expecting to see mounting holes for the speaker but perhaps these are just drilled into the "card" to accept self tapping screws ?.