Mate you could try a spare parts shop! They might have them or be able to get them in!
I have always gotten stuff like this from a auto electrical wholesaler! ( I don't know what is around Dubbo or even if they would sell just one to you!)
Maybe your best bet is to just go to a sparky and get him to get hold of one for you!

If all of the places I mention are like the wreckers!( To far! ) You could always go to Melbourne and get 1200rallycars extra pump! lol!

Hey just something more to what 1200rallycar has said about pressure!
( I have never messed with webbers! Except take a downdraft one of my old 1200 as it was just to big!)
But on our standard carbies ( boosted )
We have the fuel pressure set to 6 psi and the needle and seat handle it ok!
( Standard it is 1.5 - 2 psi)
This might mean nothing to you guys but its just a fact I thought you might like to know!