Using as many new fasteners as possible when rebuilding a motorcycle will make the task easier and allow the correct torque to be applied more accurately than reusing old stretched and damaged items. The same strategy applies to washers, from simple flat-plate washers through to wavy, spring and thrust washers. If in doubt simply replace.
Specifying OE parts is one of the best ways to achieve perfection.
Other sizes and types of Washer you may wish to consider: