To ensure reliability, purchase GM part # 12551507 Seal,Engine Coolant Thermostat(O Ring). It is sometimes referred to as Cadillac Thermostat Gasket. 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 Escalade, Fleetwood models.
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