Renewing all the worn and potential wear-prone components during a transmission overhaul will attain the best results.
Interfacing old, worn parts with new will lead to premature wear of the new parts and compromise long term durability, a positive, crisp action and, ultimately, reliability.
Other components you may wish to consider to aid you with a successful gearbox overhaul:
Add as many items as you wish to the same shopping cart, new bearings 600A0500 washers 92022110992200137592022112 & circlips 9203301592033026 for example, and still only pay the same single fixed price shipping cost.
This component may have other, sometimes unrelated, applications, within the Kawasaki model range. So, please always check by the part-number rather than the description prior to ordering.