Ketofa Ignition Coil SR320 SR340 SR380 SR400 SR420 BR320 BR340 BR420, 4203 400 1301, 4203 400 1302 Fits STIHL Backpack Blowers Aftermarket replacement non-original ignition coil. Fits STIHL backpack blowers / sprayer: SR340, SR420, BR340 & BR420. Replaces STIHL OEM parts: 4203 400 1301 & 4203 400 1302