And here is a photo before I took it off. The regulator has been pivoted away for visual clarity in this pic. I wonder if it was supposed to be holding that relay seen in autokunst's pic above. I know I had a relay that was hanging down unattached in that area. Independent of the 3 standard ones next to the regulator. But the bracket does not really have any obvious attachment point for that relay holder however. I should look at the wiring diagram and try to find it.
I'm guessing it's a late model only thing.