Original Equipment Stihl Anti-Vibration Spring, code 000-791-3104, fits models MS171 MS181 MS181C MS211 chain saws. Please see position 5 in the exploded view diagram. We sell many replacement parts for the most manufacturers chain saws If you don't see the parts you need listed please contact us we would love to earn your business. We are listing new items frequently so please check our store often. Part Numbers:0000-791-3104 We stock a wide variety of replacement parts for Agricultural Equipment please contact us if you have any questions or if you would like more information.