How did you manage to get wires from the original lights to behind the check panel? Its about impossible to take the headliner panel off, and I havn't figured out any other way yet.
startin from the drivers side light.
pop the light out.
pull the weatherstripping down.
gather all your wires together (dont need to be wired up yet).
fish it through the corner where the headliner meets the black visor panel.
once through there just pull the wires through the check panel hole and tuck the wires between the windshield and black panel.
the hardest part is gettin it through that corner, but once you pull down the weatherstripping youll see a small passage. wiring is simple of course, just wire it exactly like the drivers side light. i guess this could also be done with the passenger side but in reverse.