I took both sides out when I installed the Towbar. You are correct - in through the trim cover on each side (one is the fuse cover, the other is the vent). I don't have any pics sorry but once you remove the trim/Vent you will see a long spring loaded screw (think the end of it was a white plastic hex shape from memory). You wont miss it. Undo it and the light assembly will pop out.