Daf 106 marker lights

Hi all
I have some led marker lights that i want to put across the sun visor of my xf 106
Anyone know where to pick up the side light power from, i have the high cab with the spots and two marker lights on each side,
i figure there must be a way through into the roof (front) for the wiring so it can be conected to the roof marker lights.
cheers in advance