One of the main problems when restoring a LE Monaro is trying to source dress rims, especially brand new ones.
Luckily there’s a company in the United States that sells what I think are reproduction units on ebay. I haven’t bought them so I’m not 100% sure if they’ll fit ok, but might be worth a shot!
I also bought some brand new centre caps for about $100 last year. I use a company called www.myus.com where I ship the products I buy from eBay or Amazon to them in the United States and then they on-ship them to me in Australia. It does look like these sellers will ship to Australia so it might be cheaper to go with direct shipping from them.
Hope this helps!