What you are asking for, is only light, and would travel on airmail very well and cheaply.
Firstly try
vossmotors@books for cars
If you do no good there, I am sure they can still be bought in Australia, I bought one from my local dealer, only the other car for our w114.
Send an email to Simon at
parts@bea.mercedes-benz.com.au
Tell him by all means I sent you, and he will give you a quote, ask him to include airmail costs, and then you can have in about ten days.
If you like his quote, he will take visa.
Regards
Col