Any grommets for a 4awg cable?

[hipwell]

Hi guys.

I'm gonna fit a sub in my 172 as I miss the bass.

Is there a grommet available which will take 4awg cable or am I going to need a stepped drill bit to make a new hole?

I had a look and all I could find is the bonnet release grommet hole but that looks mega tight and probably only good for 8awg