Bolt-flanged,6x40

Overhauling the selector assembly means renewing as many of the wear and damage prone components as possible, when replacing this component. This will attain the best results, as interfacing used parts with new will lead to premature wear of the new parts, and a less smooth transmission action.
Other gear selector parts you may wish to consider:

131451058
132391020
132391050
130G0640
130911032
130911033
480J3000
131401019
131401050
131401020
131401051
490471008
130P0625
130CA0625
131561038
920751112
920751175
131611114
92081076
131681034
920271139
140141008
481J1200
920011134
920221095
920431044
920811094
92001131
92043076
92081112

Renew all the interfacing parts for the best result. Order new gaskets and gasket sealant, try this: 08C70K0234M as used by trade professionals.

Are there any other parts that may be better being renewed than repaired in the transmission?

This component may have other applications within the Kawasaki model lineup.