Description Reviews MINI Cooper Oil Pump Chain Kit. Fits all Gen 2 MINI's with the N12, N14, N16, or N18 engines. Fits both Cooper and Cooper S, N12, N14, N16, N18. We also sell the sprocket bolt if you need it! Cryo Treated & comes with: MINI Chain Crank Sprocket: 11-21-7-588-996 MINI Oil Pump Chain: 11-27-7-500-502