When overhauling the gearbox/selector drum & forks, replacing as many of the wear and damage prone components as possible will simplify the assembly process. The washers in particular, act as spacer shims and need to be perfect with zero wear and/or damage.
This will maintain the smooth running and change quality, basically a lovely smooth and positive action.
You may wish to consider some of these other transmission components:
Please be aware that this component may have other applications within the Honda model range, so check the part-numbers you order are correct for your model and application.
Pro workshop gasket sealant 08CRAHLG120G - easy to apply with professional results.