Obviously it has to be resistant to Petrol and fit the shape for a good seal and that's where they get you because no one else makes/supplies (copyright) that part.
Going on the workshop manual for an AU falcon, the pump is suspended from the plate/cover on the top of the tank and sits 'clear' of the bottom of the tank, does yours?.
On the bottom is shown a 'sock' that acts as the filter, there is also an 'O' ring that goes on the top plate/cover to stop leaking from around the pump body.
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