I recently parted out a 1986 Monte Carlo LS and it had the heavy duty suspension option with 1 1/8" front sway bar and rear sway bar with front frame stiffeners. Included is all hardware seen and needed to successfully install this stuff. Will fit 1981-8 GM G-Body cars and possibly 1978-80 but do your research for the earlier years. Price is firm. Call if interested. Thanx