Dropped my X5 off at 10:15am, picked it up at 1:30pm
SIB# 52 09 10
E70 Seat Noises
Installed new Blind Rivets Item # 52 10 7 042 164
Installed new Seat buffering material Item# 61 13 6 920 760
Noise is much better now, but still there

It is very muffled though. My SA is going to follow up with BMW, and check other SIB/TSB relating to E70 Driver Seat problems.
Just wanted to post all the info I have, for anyone else dealing with this!
Cheers!
Adam