That is a special bolt you are not going to buy at the hardware store. It seems it is not available separately from Yamaha either. It is basically the pin the caliper slides on when releasing. Hence the seals on both ends. It is shouldered on the bracket side so it tightens up. This was gummed up on mine so I had to replace the seals and lube it up. Seems you are going to probably have to buy a new or good used caliper. Or get lucky and find someone that has one of them lying around.
The outer seal is missing as well, but those can be purchased from Yamaha or are in the kit listed above.
Bolt store.
sorry had to say it...
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