When overhauling the middle drive gear mechanism, replacing as many of the worn (possibly damaged?) items as possible will simplify the building process and subsequent adjustments required to set up the assembly correctly.
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Please be aware that interfacing worn parts with new components may cause premature wear to those new parts!
More related components you may wish to consider:
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Add as many items to the same shopping cart as you wish, new screws 9014908152 bolts 9702708030 nuts 9018514070 & seals 9310135097 for example, and still only pay the same single fixed price shipping cost.
Please be aware that this component may have other applications within the Yamaha model range.