OP - despite what everyone has done pointing you to overseas stores, its actually not too hard to get hold of parts in australia. The usual places to start are Tooley imports in Hornsby NSW and HSY autoparts who have warehouses all over the place nowadays.
The yanks pretty much never got any 1.5 diesels which makes buying the pistons a bit tricky from the US. However, you can get valves, stem seals, bearings, bolts etc locally. You ought to be able to get ring sets still aswell. At 620,000km, you are likely to go oversize if you rebuild it and you might need to jump to the third oversize depending on the piston availability.
Failing all that, there are even some local's with 1.5D engines just sitting in their sheds... like me.
Best of luck with the build! PM me if you have any specific questions.
'07 Touareg V6 TDI with air suspension
'98 Mk3 Cabriolet 2.0 8V
'99 A4 Quattro 1.8T
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