Hey guys, this is prolly a dumb question. Do stock LS cobalts come with any rear sway bars? Like i want to buy a 22mm progressive rear sway bar but does my car already have one and the aftermarket is just bigger in diameter or did my car not come with one at all. Also if it did not come with one, do i have to drill holes to get the progressive bar on or does it just bolt right up to it? Thanks