Matt,
Don't listen to Tom (
), the brackets that came with the kit from E-M are made of nothing more than common .125" thick angle iron. You can easily make your own. Dimensions are 1.5" x1.5"x8"L. All mounting holes are generously slotted to allow adjustment.
Mike...
Just kidding about Tom's advice, he's spot on about Fred being able to help you.
