Wow, looks like you drive through hay fields? or the mechanic was snoozing when checking the filter?
I believe that is the bolt on the coil pack, which is correct, not sure of the telemetry of the pic, but it is the one on the coil pack.
When I built my cable the ring terminals were copper coated with silver anti corrosion, so I put the washer on top so it would only get crushed when I tightened it. There might be other ring terminals that are different or maybe better material, just what I could get at a Autozone.