The #8 goes to the terminal marked with the arrow.
The light ground and supply ground go to the green ground screws.
The base plate is brass/bronze, so it connects all grounds together through the metal plate.
It looks like you have a green ground from the supply.
If no ground, you need to have one for 120 volt lights.
Or, switch to 12 volt lights.

The light ground and supply ground go to the green ground screws.
The base plate is brass/bronze, so it connects all grounds together through the metal plate.
It looks like you have a green ground from the supply.
If no ground, you need to have one for 120 volt lights.
Or, switch to 12 volt lights.
