Many non boxed LCAs have the holes for the rear bar already drilled. I boxed a set of LCAs for a '87 Cutlass by dropping them off at my local welder and asking him to tack metal across the bottom. He did a nice job and also put 1/2" pipe inside the bars to prevent crushing. Much cheaper than buying aftermarket. Whether a G body comes with a rear bar or not they aren't boxed. They just put a brace inside the prevent crushing when tightening the sway bar mounting bolts down.
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