Picked up an eBay purchase yesterday near Whitlesea (North of Melbourne, Vic).
The guy had a heap of caravan axles with and without brakes (electric and mechanical) and both straight and drop axles, as well as springs. Most brand new and all around 2m wide.
His phone number is 0406 185588 and his name Nic. They are going cheap.
I have his permission to tell you and post his number.