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Flatrod,
as far as I know, the grille no longer exists as a Ford part (in stock). I may have purchased one of the last ones replacing one I had damaged a year and a half ago. There are owners who have removed them and still have them on a shelf somewhere. Speaking with Fred Goodnow this last Saturday in Carlisle, the engine temp with or without the grille is only drastic when tracking the FGT. And I must agree as the weekend before last I was at VIR, and that is the first time in about 18,000 miles that the temp climbed somewhere between 220 and 240. The thing that really caught my attention was using 3/4 a tank of fuel in a bit less than an hour. I believe your best chance to find a grille is through this forum, still, the best source for all things FGT. Let me know how the search goes, I can talk to at least 2 owners who have removed their grilles.
Pete S.