Firewall grommet on a Streetwise

I am struggling to find a suitable grommet to run my power cable through for an amplifier. All threads on here seem to point to a grommet under the coolant tank however I don't have one under mine on an 04 Streetwise. There is a large one under the tank itself but it seems to come out behind the heater stuff. Does anyone know of a different one that is easy to access, as I don't want to be drilling holes in the car.



Thanks,

Harrison

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