Specifying factory supplied O-rings means buying parts made to Japanese quality control standards, indeed components that were deemed good enough by the factory when the machine rolled off the production line.
Related O-Ring you may wish to purchase at the same time:
Shopping, here at CMS, is the easy way to purchase all your Japanese motorcycle parts online. Ask a member of our staff, if you are unsure what to do, to help guide you through our user-friendly system from opening an account to ordering the parts you require.