Gday John I bought 3 sets off Modak Motorcycles in Melbourne Australia a little while ago. It is an old school shop but a lot of NOS parts. Send them an email if you have no luck closer to home. Good luck Mick.
Thanks John, it's not easy with the one word search engine.
Part numbers work really well, even part of them.
For example 66-1 will get you some interesting results.