To ensure reliability, purchase GM part # 20989650 Engine Electrical GENERATOR. It is sometimes referred to as Hummer Alternator. 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 Hummer H2 models.
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