Where to buy forged pistons to suit my turbo magnum

Hey guys I've got a stock 5.9 magnum bottom end. I've been running a turbo for a couple of years and a piston has finally let go. I want to replace the pistons with forged ones with low enough comp to suit the turbo. Can anyone suggest some pistons or what company I should talk to. I'm in Australia and I don't know where to buy them in the states as I can't get them here.