To ensure reliability, purchase GM part # 399423 Lock, Exhaust Manifold Bolt. 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, Regal models. It fits Cadillac Brougham, Deville, Fleetwood. It also fits Chevrolet Caprice, Impala, Malibu. This also fits Pontiac Bonneville, Grand Prix, Parisienne.
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