Normally you do not need to replace these unless there is a need to do so. If you are replacing the control arm and you want to replace them then that is fine but I have always reused them unless they are rusted and not able to turn. Clearly these are to adjust your alignment so they need to be able to turn.
In order to replace them, I attached the diagram that shows how they go together. Number 14 and 16 are the cam bolt and nut. You simply remove the nut and use a punch and hammer to push out the bolt from the bushing.
If you replace them or not, try to remember or mark the general orientation so that when you do an alignment it is as close as it can be and you don't need to adjust it that much.
Let me know if you have other questions. Thanks
Images (Click to enlarge)
Friday, October 9th, 2020 AT 4:07 PM