Welcome to the forum!
What year is your LS? I don't see anything resembling #9 in your diagram for the 2000, 2002, 2004, or 2006 model year and cannot tell from the thumbnail what the heck it would be. For the noise you describe though, I would have started with the sway bar end links, #12 in your thumbnail.
You might try using
this site as you can order the parts straight from here as well. This is what I used as reference above.
-Rod