Here is a photo of the alignment of the second hole (large) with just the smaller bolt started.
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Here you can see where I had to remove some of the metal.
Here you can see better the difference between the machined surface inside the hole, and the surface in which I had to remove to get the bracket to fit.
Take it for what it is worth. Mine wasn't made right and I could not get it to work like g20-dubo suggested, it tried. But, five minutes with a dremel will fix it. No biggie.