W201 brake question

[MS 190 2.6]

I was going to replace the front disks and pads on my 87 190 last night, but noticed my Hanes manual suggests the caliper and guide pin bolts are not reusable. Any opinions on the accuracy of this? I have never run into this issue on any of my Japanese or domestic cars but don't want to compromise safety. If this is necessary does anyone know the bolt grades and sizes?

thanks