To ensure reliability, purchase GM part # 14040862 Switch Assembly, Electronic Spark Control Vacuum. 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 Chevrolet Astro, Blazer, G20 models. It fits GMC C2500, K1500, Suburban.
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