I don't know if they will ship to South Africa or what the cost would be but this place has your windshield:
Classic Auto Glass - Windshield Glass, Back Glass, Door Glass, Vent Window Glass and Quarter Window Glass - Plymouth Fury, 1960, 1961, 1962, 1963, 1964, 1965, 1966, 1967, 1968, 60, 61...