The designation F-8M was reserved for a proposal for the
remanufacture of low-time F-8As. However, by this time, very few
F-8As were still around and the idea never achieved fruition.
Sources:
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Vought F-8 Crusader, Peter Mersky, Osprey, 1981.
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The American Fighter, Enzo Angelucci and Peter Bowers, Orion, 1987.
-
United States Navy Aircraft Since 1911, Gordon Swanborough and
Peter M. Bowers, Smithsonian, 1989.
-
Ray Wagner, American Combat Planes, Third Enlarged Edition,
Doubleday, 1982.