According to the service manual there are a handful of suspension bolts that should be replaced but that's highly debated depending on who you talk to.
On the front -
1. Top mount nuts can be reused (the 3 that hold the strut to the body)
2. Top mount gaskets (get new, they're cheap)
3. Top mounts (replace depending on condition)
4. Swaybar links (replace depending on condition)
5. Brake wear indicator (only 1 on driver's side, will probably break when removing)
5. Caliper bracket bolts - reuse (I advise you remove the caliper and bracket as an assembly, do not remove the 2 allen bolts holding the caliper to the bracket)
6. Rotor retaining screw (reuse if not damaged, apply anti-seize when installing hand tight)
7. ABS sensor allen bolt - reuse
8. Headlight level arm (unclip from control arm, do not remove nut)
9. Spindle pinch bolt that holds the strut - reuse
10. Lower control arm bolts (I've reused several times but have replaced once - remember they are torque to yield stretch bolts)
Rear suspension -
1. Upper shock mount (I would replace all the hardware)
2. Lower shock mount (unless the mount is bad there's no reason to replace anything)
3. New shocks should have new nuts for top and bottom
4. Swaybar links (replace depending on condition)
5. Lower control arm bolts - reuse
6. Lower and upper spring rubber (replace depending on condition)
There are kits out there that have everything you need when replacing suspension but they are expensive and most likely the majority of the hardware doesn't need replacing.
Here's the kit for ECS for example -
https://www.ecstuning.com/BMW-E82-13...its/ES2586384/