[Citroënbender]

There’s no mention by the suppliers that it’s a reco unit, so I’d presume it’s aftermarket. Whether Chinese or European I have no idea. Aftermarket bits are probably going to fit if required.

To narrow down the whine, carefully disconnect alternator from the electrical system (insulate each connector well during the test) and run the car on battery only. If the whine is still there it’s either the drive (belt, pulleys) or bearings.

Edit to clarify, you only need to remove the pulley nut if replacing the rotating assembly or front bearing (a 6303, common).