Johnny, being Scott Drake, they won't be Aussie made, and they don't divulge their sources, but any alloy radiator under $800aud could safely be assumed to be asian made.
They have a 12 month warranty, assuming you've checked for stray current, and a correct coolant mix. (Too weak, or too strong a coolant mix becomes acidic, and acidic coolant, or Stray current, can kill a radiator in less than a month!