Your nearest bet might be a guy on the Goldie who is an ossa freak, he is a sail maker...sorry all I can remember, he bought a GP2 off me about 10 yrs ago.
Phil Young in Wachope N.S.W. might be another lead.
One thing I've found with Ossa owners is they may have ten of something you need, but they won't part with one.....
Good luck