I just had a friend drop by , he was showing off his new to him 2009 SS, very nice, until you looked at the LCA’s , he has a new set on order from GM dealership. I’m going to be supervising his work at changing those arms in two weeks.
these pins look to be sloppy in the knuckles, they are torqued to 37 ft lbs.

That’s appropriately 2/10’s of an inch, sloppy very sloppy! His are stamped steel! So, not all original as the seller stated! He has the small LS/LT discs up front, 10.65 of an inch and a funny line on the rotor where the brake pads miss it.
It is a real SS , maintained by an uninformed person, nobody to confirm their errors.

I think they just ordered rotors for an HHR and forgot the SS part!