These hangers mount to the rear bumper bracket and use a muffler clamp to attach to the tail pipe. Muffler clamp not included. for use on ALL 1970-1972 Cutlass, 442, and Hurst/Olds models WITH EXHAUST Tips. These are made exactly like factory. Fits all 1970-72 Cutlass / 442 / W-30 / W-31 / Rally 350 models. Sold as a pair.