Dave, don't buy a thing from the dealer in Australia. I buy all my parts from the USA and get them shipped to Australia. There are heaps of guys on this forum as above that are willing to help you out. The one thing I have bought from the dealer was an Oil Pressure Sender because I needed it ASAP and it cost me $60 AUD. If you look at ECS they are less than $10 USD.

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2004 E53 4.4L N62