This and a number of other related fuel tank fitting bits and pieces are better being renewed, especially if you have purchased, or are about to purchase a new fuel tank. Even if you have had your old tank refurbished you will have spent a great deal of money if it has been done to a professional standard. New anti-vibe mounts and fasteners will help the tank remain in good shape when refitted over the long term.
Other fittings you may wish to consider regarding your fuel tank: