Well after a few weeks of searching I can't find these anywhere. I looked for stop sleeves, stop swages, and round swages, in online stores and in normal stores. 2 stores in Australia had something close but turned out it only had one hole so only fits on the end.
Very strange considering Australia is boating mad, and I'm in Sydney, not some outback sheep station. If only they'd send them in envelope via normal mail instead of FedEx for $40, otherwise I'd get them from the US.
So 2 options.
Try an alternative like a small standard swage or fishing line sinker. (anyone tried any of these)
Buy 1 single one from the local Hobie dealer for $10 and probably have to wait for it to be delivered from US.
It's kind of against my principles really to pay $10 or more for a piece that costs 50 cents.