To ensure reliability, purchase GM part # 10245059 Insulator, Rear Spring. It is sometimes referred to as Pontiac 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 Pontiac Aztek, Montana, Trans Sport models.
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