I bought the kit from Finish Line, but made my own mounting hardware. See the picture below. The mounting bar is steel stock I purchased from Home Depot (1" I think). The mounting brackets are made from angle brackets and a short sleeve made also from steel stock from Home Depot and a flat piece of steel stock on the ends. The sleeve is the next size up steel stock. I wrapped the end of the mounting bar with some red gasket material that I purchased from Sears. With the gasket material on the end of the bar, it is just the right thickness to slip into the sleeve. The brackets that attach the fans to the bar were fashioned from an angle bracket that is used for building decks. It had a small hole in one side of the "L" that I drilled larger to allow the spindle of the motor to fit through. I did a little trimming on the bracket so that it did not show from the front. I polished it all up and gave it a coat of POR-15 clear coat.
Here is another shot from straight on.
