Where to pass battery cable through firewall, 4 speed car.

Working on relocating my battery to the trunk. Wiring and such aren't an issue, nor gauge. What I am struggling with is how to get the heavy battery cable thought the firewall. I see lots of people use the clutch rod hole, but with a 4 speed, that isn't an option.

Need some ideas on how and where to do this. Thought about one of those insulated lugs, but not even sure where to put it.

Any ideas or experience? Pictures would be great, too.