This is a clutch and driver pulley assembly for the Baja Sun City 50 (SC50), which does NOT include the clutch bell. The clutch and pulley assembly, (aka driver pulley or variator) comes complete as shown in the photo.
Although made for the Baja Sun City 50 (SC50) with the VIN number beginning with LAWT, this unit might work with other 50cc 4-stroke QMB139 engines.