To ensure reliability, purchase GM part # 20828594 Cover, Body Rear Wiring Harness Accessory Relay Block Housing. 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 Buick Lucerne models. It fits Cadillac DTS.
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