Happened to me too......

I made a claim on warrenty, they shouldn't have fallen off etc etc. Yamaha agreed and sent me a new set.

You can get just the rubbers, they come as a pair - dunno the part number though.

When you do get them, they look the same, but they are ever so trapiziod (narrower at one end than the other - for the non-english readers), the fatter end goes to the rear of the bike.

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Never underestimate the power of stupid people in large groups.