Overhauling/repairing the transmission? Renewing as many of the worn and damaged components at the same time will attain the best results.
Interfacing used parts with new will lead to premature wear of the new parts and a less smooth and noisier transmission. From the gears, through to the shifting drum/forks and the actual change mechanism control - all need a thorough inspection to avoid any weak links remaining.
Other transmission related components you may wish to consider:
Add as many components as you wish to the same shopping cart, new bearings 90387060659330600426 washers 9020921332 and circlips 93440250849900920400 for example, and still only pay the same single fixed price shipping cost.
Pro-workshop gasket sealant 08C70K0234M to complete the job like a professional.
This component may have other applications within the Yamaha model range.