The American-made, patented forks use torsion technology to provide a fully integrated in-fork suspension that reduces vibrations and bouncing associated with machine operation on rough or uneven terrain. These easy-to-install direct replacement forks are a great way to upgrade the ride of your mower, and they take less than an hour to install. Compatible With John Deere ZTrak Model Lawn Mowers: Z710A, Z720A, Z910A, Z915B, Z915E, Z920A, Z920M, Z920R, Z925A, Z925M, Z930A, Z930M, Z930R, Z945M, Z950A, Z950M, Z950R, Z955M, Z960A, Z960M, Z960R, Z970A, Z970R, Z994.