I should have provided more explanation. The Australian importer/distributor advised me that they no longer sell Yanmar tractors as pricing has made it too expensive for the Australian market. No other importer has been appointed. Other Yanmar products such as excavators, generators and marine engines are imported by different companies and they have not taken up the opportunity to import Yanmar tractors. I still can obtain fluid filters but anything more will need to be imported. The previous Yanmar dealers have moved onto other brands and no longer support Yanmar tractors. The modern Australian Yanmars were actually Cub Cadet Yanmars imported from the U.S. with some modification to meet Australian rules requiring front end loaders to be self levelling.
you should be able to google yanmar dealers in the U.S. Call or send them an email asking if they would be willing to ship you any parts you might need. I don't think dealers would have a problem shipping to your country. They aren't paying for shipping, and most would most likely ship UPS, FEDEX , etc,.