To ensure reliability, purchase GM part # 329121 Nut, High Crown .250X20.00X .000 Cb. It is sometimes referred to as GMC Mirror Cover. 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 GMC C2500, K1500, Suburban models.
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