Swing Arm Bushes - Fork Bushes or Fork Bushings are listed by OD x ID x Width x Thickness. Swing Arm Bushes are listed by OD x ID x Length. Fork bushings are generally made of copper with a teflon coat. If you can see copper colour through the grey colour of the teflon they could be worn and require changing. There are other noticeable signs of wear such as excessive play but please refer to your service manual or one of the many forums found on the subject via Google regarding "Changing Fork Bushings". It's always a good idea to change these when you do a front fork overhaul along with the seals. 
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