To ensure reliability, purchase GM part # 55504354 Spark Plug Assembly, Gas Eng Ign. It is sometimes referred to as Cadillac Spark Plug. 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 CT6, XT4, XT5 models.
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