Variator Assembly for gy6 50ccRoller Size16*13mm Fit GY6 QMB139 50cc Scooter Moped ATV You will get: 1*clutch Assembly 1*Variator Assembly 1* 669 belt, You only need to confirm the corresponding e-ngine or model. These three parts are applicable in sets. High quality clutch:22 Splines Inside The Clutch Drum/BellID of Spline Area: 12mmOD of Drum: 115mm ID of Drum: 105mmFits GY6 50cc 4 Stroke 139QMB Engine With Short Case The Belt is made of high heat-resistant and high-strength materialsBelt key parameter 669x18x30, Premium belt provides longer durability for applications. Save your choice time: A clutch kit that meets your driveline needs eliminates the time and effort required to find the right model (and the risk of buying the wrong model).