I managed to get 0 guage through. I cut my bonnect release grommet horizontally then fairy liquided the cable. Poked a metal coathanger in there to make a pilot, then pushed like i had to get this cable through to save my life. Then submerged all this in silicone!!! Cus it was touching the edges as no grommet left to cover it.Ignore that its the right section unless i'm imagining ICE in the title? You'll probably have to drill a hole for 0 gauge as the bonnet release grommet won't take that I don't think.