Gippslander... not sure about shipping to Oz as I am in Canada, his price was about $220 and 3 week order time, i got the proper tank, pegs, brake pedal, chain guide/brake stay, front and back brake arms and a front hub from Curt at thirty bee (the link Slakewell posted)
I heard circle f and jemco also make pipes but I haven't checked with them yet.
If the pegs don't fit Al Buehler said he had new pegs that fit the 77.
The guy who has the 78 I posted thinks he may have an extra airbox but not sure, let me know when your airbox gets there, if i haven't found one I would be interested in your old one.
Maurice