Genuine replacement armature used on select 5 HP horizontal and vertical shaft, and 550 series engines. This OEM part ensures proper fit and performance to maintain the life of your Briggs & Stratton engine. Item: Replacement Ignition Coil Magneto Armature Package Dimensions: 2-3/4" L x 3-1/2" W x 4" H For Use With: Select 5 HP horizontal and vertical shaft and 550 series engines