My apologies, Lawrence! I spoke (way) too soon. Just came in from a decent once-over of the grill in question, and that bracket is not conducive to full functioning of the ash sweep. It allows the vents to move from full open to full closed, but it does NOT allow the fins to move enough to sweep the ash out of the bowl. I'm not yet sure if this is due to the shape of the bracket, or to its thickness, or both.
Sorry for the false lead.
Guess who's in the market for one of your aftermarket ash can brackets now, buddy? ;-)