I’d get a rough estimate of the parts new and then take about 10-15% off that before shipping and shipping insurance.
Pelvis hit the pricing rather well. Make sure their below the average cost of the parts (or nearest equivalent), as nobody in their right mind will pay a new part price for used items. However, just tossing the rough prices of those parts and then converting to the AUD from USD, again, I have to agree with pelvis suggestion. Somewhere between $700-800 AUD + shipping is a fair asking price.