Whether you’re upgrading or replacing parts, the M142955 Lock Nut simplifies the process, give you a smooth, trouble-free operation. Z225, Z235, Z245, Z255, Z355E, Z425, Z435, Z445; S240; LA150, LA175; LX280; GX255, GX325, GX335, GX345, GX355; MCS, MC519; Hillmaster.