As you said, I suspect that Beko is using different part numbers to stop people from ordering parts from overseas.
I checked with the spare parts supplier that Beko recommends in Australia and this is the part, albeit with their own part number.
https://shop.onlineappliancespares.com.au/part/m1536594-302027/46559
Looking at the picture, in your experience can you recommend a Beko seal that would be compatible, or does Beko use a wide range of seals?
Thanks again for your help.