You should also be able to get the tube and olive from an auto store such as Auto-one, Repco or Supercheap Auto. You most likely won't get the fitting there though as most Aus stuff is BSP and not NPT.
The larger nut and olive to suit 1/2" tube is still available as I purchased one last month. Maybe it has new number.
Regards
Phil
944A - Machine SN 43A2589 Engine SN 90A284
955K- Machine SN 71J3772 Engine SN 83Z0704
D6 SN's 4R732sp, 5R2724, 5R4832
D8 SN's 15A1254, 15A2287, 15A2723