The washers were designed to snap into a square hole in the OEM 22ga sheetmetal hood but the cf of the Seibon was necessarily much thicker. The latches would not engage properly to hold the washers securely in place and they would fall out with a gentle nudge.
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So I fabbed a set of plates from 22ga sheetmetal purchased from Tractor Supply. I cut them out with a grinder, used a drill and Dremel for the square openings and did the final fit with a file. There is not much room from too tight to it falls right out so make the hole a little small and file it up to size, checking often. I had to toss one and remake it. Then I painted it with self-etching primer and several coats of enamel.
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After carefully locating and drilling the holes I used a pop rivet gun to install the plates. Make sure the angle the plates are installed at matches the angle the OEM hood uses or the washers will not spray in the right spot. I had to redrill to adjust the driver side to the proper angle.
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