"annoying" vibration - driveshaft bushing or collar nut?

[bimmerteck]

Yes, as Jim said, they are often already marked, though sometimes the marks are hard to find so it's faster to make your own before you pull the drive shaft apart. In your case since you didn't mark it you'll need to find the marks someone else made.

[lolcantturn]

Well said. I remember mine having some marks, I'll put it together and see what the outcome is.