[srg]

hi everyone,

we have a 2006 ZX4 sedan that's been making some squeeking noises since the fall. we disregarded it due to a busy time in our family since we only hear the squeeking when we go over bumps on the road. i had no idea what was causing the sound, so i went under the car and started spraying different areas with silicone lubricant to hopefully get rid of it. after several weeks of testing, i've found where the squeeking is coming from!

i took some pictures under the car today...can someone help me identify the part circled in red, and let me know if it is replaceable?

pictures are taken from the passenger side, basically under the rear wheel.





to temporarily eliminate the annoying squeek, i've been spraying this area with silicone lubricant..i'm assuming this part is worn?





any idea if the part i'm spraying is replaceable on its own? it has 2 bolts holding the piece at the top, and it looks like a huge job if i have to replace the entire metal piece

thanks for everyone's help