ITEM NAME:Ignition Coil Assy Compatible with Stihl MS171, MS171C, MS181, MS181C, MS211, Description: Aftermarket Stihl Replacement Ignition Coil Assembly Fits Stihl Model(s): MS171 MS171C MS181 MS181C MS211 MS211C Chainsaws Replaces Stihl OEM Part Number(s): 1139 400 1307, 11394001307 Size:approx.16x6cm High quality,Non original Specification: Please note that some models have 2 switch wires, if this is the case on your machine please follow these instructions; Only one spade connector on the coil, put one switch wire on the spade and the other bolts to earth through the bolt that fixes the coil in place. Package Includes: 1Piece Ignition Coil Assembly SKU: FUZ0001737460028361.Fits Stihl Model(s): MS171 MS171C MS181 MS181C MS211 MS211C Chainsaws. Replaces Stihl OEM Part Number(s): 1139 400 1307, 11394001307. Only one spade connector on the coil, put one switch wire on the spade and the other bolts to earth through the bolt that fixes the coil in place.