Try Adam here first, if not Greg at Classicozwreck can freight fron NSW. Make sure you specify 308 TH400 tailshaft suit ute, van, wagon or Statesman. You don't want 350 TH400 tailshaft as these have a big rear uni too.
George only about 4.5 years of Statesman (plus HQ with 350) had big front uni. The other almost 9 years of Statesman production used the smaller 1" uni.