My left fog broke just like that a few months back. I was going to buy a new one from Ford and polish the other one, but after looking closely, the remaining original was deeply pitted. Didn't think I could polish/ sand enought to get it all out. I just bought two new ones from Rockauto for less that the price of one new OEM version.
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"Government is not the solution to our problem, government IS the problem." Ronald Reagan