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I cut a small section (about 8 inches) of the arch out of a front fender I had. It fit perfectly on the top of the arch in the rear of my 78 Bronco. If you have the extra fender and don't need it then cut it and go for it.
BTW, the fender I cut was mashed in the front corner so no good to use as a complete fender panel, just so everyone knows and doesn't yell at me.