To ensure reliability, purchase GM part # 11588726 Bolt, Heavy Hx Acorn Flange Head. It is sometimes referred to as Buick Belt Tensioner 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 Allure, Enclave, Regal models.
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