To ensure reliability, purchase GM part # 16036503 Calpak Assembly. It is sometimes referred to as Buick Engine Control Module. 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 Regal, Riviera models.
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