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P co said..
Swivel fins. Len Dibben is the only one I know using them in WA. You may be able to track him down and see if he has any.
You can find Len on Facebbok and PM him. If that doesn't work let me know and I'll Get in touch with him. He's recently got rid of a heap of gear but you never know, he may have something in a box somewhere. You would probably need to get a set, doubt he'd have any singles? Len is in WA.