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I called FCP and they sent me the 180 amp voltage regulator for the Valeo alternator (or what they thought was the correct voltage regulator).
I pulled out the alternator.
I started taking disassembling it and figured out the FCP regulator was the wrong one.
After talking with FCP and competitors, they say they don't have the Valeo voltage regulator, nor can they get it. They told me to buy a new alternator for $400.
There must be a army of BMW owners that have changed the voltage regulator in their Valeo alternator.
Where does everyone buy their Valeo voltage regulators?
Sad you can't just get the regulator you want. My recent experience with an alternator having 270,000+km failing showed problems with diodes, bearings and worn brushes. I was happy to just put in a new one. Especially since R&R was a massive undertaking on an M54 engine.