Yes, get the Z3 reinforcement plates.
You'll need 3 new lock nuts per side; 2 to hold the mount and 1 to secure the shock. Do not re-use the old ones. I just got them from the dealer.
<img src='http://www.geocities.com/royb9t8/MY_BMW_2.jpg' border='0' alt='user posted image' />
<span style='color:blue'>My ass may be dumb, but I ain't no dumb ass!</span>