I'm glad I rediscovered what that was.

Years ago, I created a larger toolbag (zipper case) with my own tools, with the Honda tools thrown in.
I've had that bracket (I must have taken off) sitting up on a shelf for 10 years, and no idea what it was.

Unfortunately, there must be a dozen or so widgets, brackets and other parts there with it, and I don't know what any of them are (but I keep them in case I need them).