If you need a complete clutch assembly for the Baja Retro 50 (RT50) or Baja Sun City (SC50S - VIN number LWGT) scooter, Monster Scooter Parts has just what you need. This pulley assembly, (aka driver pulley or variator) comes complete as shown in the photos.
Although made for the Baja Retro 50 (RT50) and Sun City 50 (SC50S - VIN number LWGT)) scooters, this unit might work with other 50cc 4-stroke QMB139 engines.
Baja Motorsports part number: RT50-269 (old number)
Baja Motorsports part number: SC50S-270 (new number)