Good service kit for Bosch water cooled alternator
These alternators are pretty expensive new, or even used, so this represents a good alternative. The kit contains all the components that can wear out, bearings, front cover with rectifier bridge and the voltage regulator. I'm not familiar with the brand of voltage regulator, and I did this job only a month ago, so it remains to see if it will last. Worst case you can reuse your old Bosch one. I have no reason to doubt the quality of the rest of the kit, though. Also be aware that you need access to a special puller and a hydraulic press to remove and reinstall the bearings. I'm a mechanic, so it was an easy task, but if you don't know what you're doing, don't risk messing up your alternator. Let someone else do it. Also be aware it's two sizes, 150A and 180A. The size is printed on the plastic front cover.
To anybody looking to rebuild their water cooled alternator from BMW this kit will do it... comes with main oring that seals the alternator to the engine and a screw to accommodate the design difference when mounting the top piece to the rotor new diode Bridge and voltage regulator is also included had mine install for 5 days now .....its holding strong at 13.8 volts driving down the road.