Hey Guys - need a little help please !

Or maybe not. The roof beam should have 3 ribs. Pre drilled holes for dome lamp in the forward and rearward. You'll need to decide if you want a little more lighting in the front or in the rear. I assume the rearward ( shown ) is the most common location for Dart. I would just start fishing with a keen sewing needle. Find one hole and the dome lamp will help find the other hole.

dome lamp.JPG