If you are considering a cylinder-head/valve/camshaft drive train overhaul then replacing as many of the components that make up the assembly as possible will help ensure the engineered integrity is maintained, with full performance and and an engine the runs without excessive mechanical clatter.
Interfacing new parts with old may cause the new parts to wear prematurely - a less than satisfactory outcome!
Other related parts you may wish to consider including new retaining bolts and valve guides, items that really should be renewed:
Add as many components as you wish to the same shopping cart, new crown nuts 9017610075 valve stem oil seals 3411211902 tappet screws 4X71215900 & nuts 9017008173 for example, and still only pay the same single fixed price shipping cost.
This component may have other applications and uses within the Yamaha model range.