To ensure reliability, purchase GM part # 555456 Valve, Exhaust. It is sometimes referred to as Buick Exhaust Valve. 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 Lesabre, Regal, Riviera models.
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