To ensure reliability, purchase GM part # 9442939 Nut, Hexagon Lock Gm301 M (1/2, 13X7/16) All Metal Prevent. 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 Roadmaster models. It fits Cadillac Brougham, Fleetwood. It also fits Chevrolet Blazer, Impala, P30. This also fits GMC C2500, K1500, Suburban.
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