if i remember correctly
last time i took out mine was 5 screws only
three on the mirror side and two near to the other end
three on the mirror ( how to take them out )
use a flat screw driver and kopek the plastic base out from the mirror ( wun spoil anything i assure you )
there will be three screws, just unscrew them and wah la, front is out already
rear 2 screws,
if i remember correctly (took out mine nearly 2 years back)
there is two screws at the back that is screwed to the original mounting of your original lights
so search somewhere in the middle of the roof
=P
happy DIY-ing