To ensure reliability, purchase GM part # 20475979 Chan Asm. It is sometimes referred to as GM Window Channel. 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 Lesabre models. It fits Cadillac Deville, Fleetwood. It also fits Oldsmobile 98, Delta 88.
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