Headlight wiring

Can someone help with this wiring? First issue is where does this ring terminal attach to? I circled it on the parts fiche below. I'm guessing it needs to be grounded on the either the voltage regulator bolt or the coil mount bolt?



The other question is if I have an extra bulb and/or incorrect headlight bulb holder. Here is the headlight holder pic:


It came with a yellow 6V bulb with two hot terminals on that bulb, but also has a socket with a small flashlight like bulb. The two hot terminals for the larger bulb appear to match up with two yellow terminals on the wiring harness to the headlight. But that leaves no hot wire for the small bulb. Oddly, the bulb in that socket was a 12V. The wiring harness to the headlight had a green with yellow stripe wire that appears to be the ground for the headlight. I'm fine with no small bulb, but want to make sure I'm looking at wiring correctly.

number 20 = frame !

is a little light just for europe !
is not necessary !

cables color modified by me ! not original !

Thanks for sorting that out!