To ensure reliability, purchase GM part # 12666591 Pulley Assembly, Belt Idler. 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 Cadillac CT4, CT6 models. It fits Chevrolet Silverado. It also fits GMC Sierra.
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