To ensure reliability, purchase GM part # 136857 Washer, External Tth Lock .438X .76X .040 Cadmium Or Zinc Plated (Opt). 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 Century, Riviera, Roadmaster models. It fits Cadillac Allante, Brougham, Escalade. It also fits Chevrolet Blazer, Camaro, Tahoe. This also fits GMC C2500, Suburban, Yukon.
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