To ensure reliability, purchase GM part # 9442940 Nut, Hexagon Head (1/2, 20, 7/16, 7111M) *Prevent, Torque. Directly from GM, genuine parts are superb with regards to quality, longevity, and fit. Every single part passed stringent quality testing, so you can be sure that it's safe, durable, and built to perform like your original parts. This part fits specific Buick Electra, Lesabre, Roadmaster models. It fits Cadillac Brougham, Fleetwood. It also fits Chevrolet G20, Impala, P30. This also fits GMC C3500, G1500, G3500.
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