To ensure reliability, purchase GM part # 12537416 Bolt/Screw, Belt Idler Pulley (Lh Thread). It is sometimes referred to as GM Idler Pulley 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 Century, Regal, Skylark models. It fits Chevrolet Lumina. It also fits Oldsmobile Achieva, Cutlass, Silhouette. This also fits Pontiac Grand Am, Trans Sport.
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