Hey Jess,
Must have been your cobra I saw when I was there last week. It has my fingerprints all over it as it was the first bare chassis\body Id seen in the flesh.
You could check out Earls performance for tilton master cylinders
www.earls.com.au. They are in Silverwater (Sydney).
www.shockreco.com.au (Somewhere Nth of the border) also sell AVO's. Im yet to check out prices at either of these guys but just a couple Ive added to my list during frequent internet searching.
Happy hunting!