i know how to flush mount my speakers like below in the picture borrowed from this site. The part i can understand is how the pod is fixed to the door as there flimsy ?
http://i2.photobucket.com/albums/y43/ClioSport_Trev/DSCF0321.jpg
http://i2.photobucket.com/albums/y43/ClioSport_Trev/DSCF0321.jpg