Straight from the manufacturer Langenhan GmbH & Co. KG (LASO). These OEM pumps have been remanufactured with OE  bearings and seals ensuring that there will be no leaks!

These pumps are still out of stock through BMW so better order one while they last. Keep in mind that without a properly working water pump  your BMW will overheat or  break down and will lead to expensive repairs.