Genuine OEM Mini Upper Crankshaft Bearing Shell, part number 11217829979. This bearing shell provides a smooth, low-friction surface for the upper portion of the crankshaft to rotate within the engine block. It is a critical component for reducing wear and ensuring the efficient operation of the engine's rotating assembly. Genuine OEM bearing shells are manufactured to precise tolerances and with specific materials to withstand high loads and temperatures, ensuring optimal engine performance and durability.