To ensure reliability, purchase GM part # 11561066 Bolt, Heavy Hx Flange Head. It is sometimes referred to as Oldsmobile 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 Oldsmobile Silhouette models.
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