2XL
Cant help you with where they are coming from.. but this is where the current ones are from:
737-300
1 x ILFC
737-400
1 x Boullion
737-700
10 x ILFC (73G)
4 x Boullion (73W)
2 x GEC (73W)
737-800
4 x CIT (738)
1 x Boullion (738)
2 x GEC (73H)
2 x Tombo (73H) - VH-VOJ still to arrive
1 x Boullion (73H)
If you read
this article it shows that DJ are capable of meeting the passenger requirements at Sydney Airport under the new agreement within a year.