Amp cable through firewall???

Hi, I have a 1994 cutless Supreme 4 door and I can't seem to find a place for the 12v power cable to go from the battery through the firewall to the trunk where the amp is. Can someone please help? Thank you!

I just got out the drill, and made my own hole. then got a grommet for it so it doesnt eventually short out...A lot of times where the cable goes through the firewall to pop the hood, the grommet there is big enough to cut a slit or hole through so you can run a wire through there.