well, the ones we always got were the aluminum brackets. I looked back at your pics and see that you have the steel ones. What you'll want to ask the dealer is does the bracket come with the stabilizers. But, you might want to check what the junk yard would charge for the brackets first before going through with dismantling it. As well as making sure the stabilizers are still on the junk vehicle. It seems that the aluminum brackets are cheaper. I dont remember paying but half that for each bracket when we did a bunch of serpentine upgrades on older vehicles. I could be wrong. But you will obviously need all the stabilizers that gm realized it needed. I bet it was a service bulletin, after it was built when they realized the brackets were breaking.