You can get most stainless fittings you want from Nova in Kings Road, New Lambton or at Specialised Wholesale on Verulam Road, but make sure you lube up your wallet for the arse-raping it'll get...
If you happen to frequent Sydney from time to time, call into T&S Valves at Ingleburn with cash in your pocket and you'll get what you need for half the money if you ask for a cash price and give them the sad eyes routine... if worst comes to worst, write out a list of what you need and give them a buzz and send it on couriers please or something, I bet it;s still cheaper than using someone online like Geordi