Hmmm well it looks like the kind of part that Yamaha describe as a collar.

Collars are used in a few places around the bike and I know the radiator has collars through the mounting rubbers ... but I can't remember whether they are plastic or metal.

Have you taken anything off the bike recently ?

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Regards
Pete

expat Kiwi - now living in Melbourne - now riding a XT660R and a XT1200Z