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100 Pack – Spark Plug – 491055T. Genuine Briggs & Stratton replacement part for small gasoline engines. This OEM part ensures proper fit and performance to maintain the life of your Briggs & Stratton engine. Fits Briggs Stratton Engine Series. Replaces Old Briggs # 491055, 805015, 72347GS, 72347, compatible with RC12YC, BCPR5ES. Track Page Views With. Does not affect spark plugs at all.