Here are dimensions to the spoiler cups



one could potentially shave down the cups flat & use this 5" X 9-3/4" brake duct I found

http://www.pitstopusa.com/detail.aspx?ID=23713
there is plenty of room around the cup & I would use 6 bolts to attach it with
the plastic is 3/16 thick all around, strong and durable


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