Serco Motorsport in Queensland are the Australian agent for CP pistons and Cometic head gaskets. They have the latter for Volvos in their catalogs, but no Volvo pistons are listed.
If you're considering Wiseco pistons and planning to hammer the engine, the latter part of
this thread on Turbobricks may be of interest with regards to your choice of gudgeon pins.
The range of Volvo performance parts available off the shelf in Australia has always been very limited.
When the AUD to USD exchange rate improves, my order to JVAB will go ahead for CP pistons, rods, and steel flywheel. And since the Euro to AUD rate isn't too shabby at present (touch wood!) I'm looking to do some shopping in Europe for a pair of cams and the KL Racing 16V plenum, along with some other of KL's goodies.
Since I have new valves, valve guides and tappets ready to go into the 16V heads, my order to Yoshifab for Sealed Power valve springs (and some other bits) will have to go in before the bottom end parts order. Then at least I can send the heads and plenum away to be dealt with.