Your piston does not fit my husqvarna 2100cd the connection rod is much wider that your piston allows. My saw is a thin ring as all 2100’s to my knowledge are. Your piston is shorter in over all height. I am very disappointed in this purchase. The only thing I can see that is correct is. it is 56mm. Will not be buying from you again. I’ll keep this pos as a reminder. Unless you want it back. I honestly don’t want to mess with it!