When overhauling the transmission, replacing as many of the wear-prone items as possible will yield a more reliable and durable result with a slicker shifting quieter running assembly.
Many of the gearbox components are becoming more difficult to source due to the age of the model they fit. Few parts, if any, are being made at the factory. So, if you are due a gearbox overhaul consider ordering the parts you need sooner rather than later?
Other items of the assembly you may wish to consider:
Add as many items as you wish to the same shopping cart, new gaskets and seals for example, and still only pay the same single fixed price shipping cost.
Don't forget to order the gaskets & seals 93102252269310214209 you require and perhaps this pro-workshop gasket sealant: 08C70K0234M.
Please be aware that this component may have other applications within the Yamaha model range so make sure the part number you order is correct for your model?