Sierra International 18-9817 Shift Shaft Bushing Tool The Sierra 18-9817 Shift Shaft Bushing Tool is interchangeable with the following: GLM 90140, Mercury 91-31107T, 91-31107, 91-23033T, 91-23033, 91-24150. Each Sierra product meets or exceeds the original equipment part it replaces. Sierra Shift Shaft Bushing Tool Meets or exceeds the original equipment quality Sierra part number: 18-9817 Interchangeable with the following: GLM 90140, Mercury 91-31107T, 91-31107, 91-23033T, 91-23033, 91-24150