Thanks for all the tips on finding the right part numbers and potential suppliers. In the end I have gone with https://www.amayama.com/en who have an office in Sydney and you only seem to have to pay for delivery from there. As noted above I did not need the rear bumpers and so just ordered:
2 x P/N: 48482-97201 - lower rear spring seat
2 x P/N: 48481-97201 - upper rear spring seat
Which came to $27.77USD = $41.38AUD with an estimated delivery date ~16days (29.03.20).
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