Product review (3 stars): Workable Fan Blade Brackets
The brackets themselves are fine.  The problem is with the details on the sales web page.  More detailed information and measurements should be given.  The hole alignment / measurements [center to center] should be included in the details.  I was able to make it work by drilling new holes in the fan blades to match those on the bracket.  On the plus side the blades now set closer to the ceiling as the arm portion does not extend as far down.