Welcome to the site !!
Can you post a picture of what parts you are specifically talking about ?? (you need a image hosting site like IMGUR , you make a account (free) you upload your pic to that , they click on the pic and it will have some links on the right side , you click on one of the links where it says COPY and then paste it here in your post (the one that says for forums and message boards)
There are several parts to the linkage , and I am unsure what bolt you are referring to , is it the main swingarm bolt ?? , the bolt that holds the shock to the linkage ?? , the bolt that holds the linkage to the swingarm ?? , or the bolt that holds the dogbone to the frame of the bike ??
You can buy the bearing kit to do the complete linkage and do it yourself if you are mechanically inclined , but if you buy them used on EBay they will still most likely need bearings replaced , if you buy them all new , it will cost a lot of money but they should all be available from Honda .... I would also highly recommend a Owners or Service Manual so you can do the job correctly and torque everything how it needs to be done ....