Tezza, As your '97 Westport is manufactured, stored in Australia, and you are currently located there, I would suggest contacting Australian Jayco directly (Jayco in Australia is owned by a different family than North America). They should be able to let you know how to go about locating/purchasing the needed struts within Australia.
Click Here for Jayco-Australia
. You will find phone numbers there to call for help answering your specific question. Btw- we loved visiting your country last year. We hope to camp next time we visit