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:
Don't forget to order the gaskets & seals you require and perhaps this pro-workshop gasket sealant: 08C70K0234M.
Add as many items as you wish to the same shopping cart, new circlips 934403007799009224009344025084 & oil seals 9310235109 for example, and still only pay the same single fixed price shipping cost.
This component may have other, sometimes unrelated, applications within the Yamaha model range. So, please always check by the part-number rather than the description.