To ensure reliability, purchase GM part # 20767137 Insulator, Rear Spring Upper. It is sometimes referred to as Cadillac Coil Spring Insulator. 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 ATS, CT4, CTS models.
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