While it is wise to replace bushings on old bike when doing this type thing if the old ones are in good shape they can be driven out and reused. The only ones I would be concerned with on this swing arm are the rubber shock bushings. The swing arm pivot bushings can be left in. Who is doing the coating? If I had the SA off I would go ahead and replace the factory pivot bushings with upgraded brass units.I have a spare new set for $39 if you want them.