To ensure reliability, purchase GM part # 12637203 Belt, Fan & Water Pump & Generator & P/S Pump. It is sometimes referred to as GM Drive Belt. 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 Chevrolet Express, Silverado models. It fits GMC Savana, Sierra.
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