These parts, like most rubber cushions and components on motorcycles, will be better being renewed as the old items will have perished or become less effective through general wear and tear.
Replacing ALL the associated items at the same time would be the best course of action.
Similar items you may wish to consider:
Please make sure that the part numbers you order are compatible with your model. CMS try to ensure that online purchasing of Japanese motorcycle spares is a pleasant and user friendly experience!