Advise for amp power wire...

[RedHotSVX]

I am installing an after market stereo with 2 amps and was trying to find a way to run the power wire from the battery to the trunk and was surprized at the lack of grommets on the firewall to run it through to the cabin.I figured there would be a few on the pass for right hand drive versions.Am I missing something,has anyone out there drilled a hole through the firewall for this?
I tried where the main harnesses run through over the accellerator pedal and to the right of the heater hose,but I guess it's a two layer firewall in those areas.