Any Pedders place will be able to fix you up. REPCO or Bursons also can probably help also. Just need the open and closed length and type of end fittings. Pick something off a vehicle of similar weight such as an F truck or Landcruiser type machine and you will be close enough for valving.
You are more than likely to jag suitable shocks in the Old Man Emu catalogue but these are unnecessarily fancy and expensive.
If you are near Brisbane WW Shock absorbers in Geebung can make exact replacements for about the same price as off the shelf models. They will even rebuild your originals. I am sure there are similar shock absorber manufacturers in all major cities.
The following user(s) said Thank You: cobbadog, Colin HD