The Liftmaster Gear Kit 41a2817 is compatible with Chamberlain Liftmaster units manufactured 1984-current. The manufacture date can be found on the motor head. Important note: use entire tube of lubrication during the installation of the gears or the drive gear will shred quickly, possibly within a couple of days.
Item# : SPM9769585313
Model # : FOSSTGDO1027000012appl