Hi @vickijones
According to the [https://www.searspartsdirect.com/model/2vowlwltb9-000247/craftsman-247377050-gas-walk-behind-mower-parts|engine parts diagram] for your model (click on ''View Engine''), the spark plug is part # [https://shop.briggsandstratton.com/products/briggs-and-stratton-491055s-spark-plug|491055S] (supplier example only)
Search online for the ''part number only'' to find suppliers that suit you best.