Check out the Toyota FJ Cruiser LED Cowl Light Kit (70-212).
Step 1: Locate the panel near the side window. Pry open the panel.
Step 2: Make sure to carefully remove the panel to preserve the clips. If you happen to damage the clips, the package does come with extras for your convenience.
Step 3: Take out the two screws circled in red.
Step 4: Mount your new FJ Cruiser LED Cowl Light Bracket and screw it back in place.
The available gap to accommodate the cowl light bracket is 3mm wide, and the mounting bracket measures at 2.9mm. Therefore, the cowl bracket will fit in very precisely and pretty snug.
Step 5: Run the wires through the engine bay and tap the wires accordingly. Put the panel back in place.
Step 6: Mount the new Toyota FJ Cruiser LED Cowl Light. Test to make sure everything works and repeat the process on the other side.