I did a quick search on eBay. No results. Have you checked with a dealer to see if it can be ordered? Maybe an auto parts store in your area has the repair manual. That will contain a step-by-step instruction for your oil change.
I would suggest looking underneath. Apologies, but not familiar with that model, mate. If it is the Hyundai brand, it will be blue. There is a REPCO store nearby you in Sydney. They may be able to help you on this. REPCO AUSTRALIA - Our Range - Oils enc(38) Additives -~