On top of the fuel tank most probably need mechanic to replace for you.
under the car at the back near the fuel tank
Holden VZ Commodore was created in 2004.
I don't even know. LOL
How to remove Window Winder Handles from VZ Holden Commodore
Yes, to change the fuel pump on a VZ Crewman, you typically need to drop the fuel tank. This is because the fuel pump is located inside the tank, making it necessary to remove the tank to access and replace the pump safely. Proper precautions should be taken to ensure safety and avoid fuel spills during the process.
Piercing the fuel filter with a screw driver relieves the pressure allowing you to remove the filter without braking the clips.
www.factoryautomanuals.com
At the rear of the engine, above the bell housing.
one word crowbar
Next to the base off indicator stalk
i dont know much about the vx commodore, but in my Vz commodore i like to put them in my center console and my coke in the cup holder DANNY!!!!!!!!
http://forums.justcommodores.com.au/holden-commodore-how-s/5541-removing-vt-vx-door-trim.html