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In cars originally equipped with leaf springs, like first- and second-gen Camaros, upgrading to a four-link may or may not be a bolt-in affair. The lower links attach to where the leaf springs used to reside, but the upper links require installing new brackets to the frame. Heidt's four-link kit for first-gen Camaros features a bolt-in upper control arm mount, which is also the rear cradle to which the coilovers attach. While not quite as adjustable as a dedicated drag four-link, the Heidt's design includes a Panhard bar to locate the rearend and offers far more flexibility when subjected to lateral loads to help prevent binding.