●Part Number : 4140 190 0601, 4140 190 0600 Please confirm the OE before purchasing. ●Compatible with Stihl KM55, KM55C, KM55R, KM55RC, MM55, FC55, HL45, HL45C, FS38, FS45, FS46, FS55, FS55C, FS55R, FS55RC, FS55T, FS55TC ●This recoil starter spring is made of metal material, which is sturdy and durable and you can use for a long time. ●The starter part with recoil starter is very easy to install and use. Fits perfectly with original equipment. ●The package includes 2 starter return springs.