For Aus would go for:
4. Launchbury
5. Kruis
6. Itoje
7. Haskell
8. Clifford
19. Harrison
20. Vunipola
I know Clifford over Billy is a hugely controversial call but I think Billy's Pace and fitness, or lack there of as well as his lack of work at the breakdown will be hugely exploited by the Pooper, which is why I've gone for the much faster, more mobile Clifford.
For 2019:
4. Itoje
5. Launchbury
6. Harrison
7. Kvesic
8. Clifford
19. Ewers
20. Vunipola
I know that not having a lock on the bench is risky but the All Blacks got away with it in the world cup and Ewers can cover if necessary. I've gone for Ewers and Vunipola on the bench as both are huge impact players and the 2 of them coming off the bench 60 mins into the game would make the opposition defence cry.