??Replace for 017 018 019 019T 021 023 025 MS170 MS180 MS190 192 CE, MS210 MS230 MS250 MS191 MS211 chainsaw . ??Fit OEM # 3/8″ LP pitch sprocket 1123 640 2073 . ??Clutch assembly fit # 1123 007 1001.Worm gear fit # 1123 640 7102 . ??Package include: 1pcs sprocket , 1pcs 6-T clutch, 1pcs sprocket bearing, 1 pcs Worm Gear ,1pcs e-clip, 1pcs washer ,1pcs spark plug. ??To be sure of purchasing the correct part,please check the details for compatibility before ordering it .