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Wiki tells me .....
"The AC 46 is a classic 14mm thread, 3/8" reach, gasket-seat spark plug with a 13/16" hex, commonly used in older GM engines"
Buick: Various models (1938–1942, 1950–1952, and 1953 40 series) often used the 46X or 46.Oldsmobile: All 8-cylinder models from 1950-1954 used AC 46X.Chevrolet: 1960-1966 Chevy trucks and various 1960s-90s V8 models often used the R46N or R46S.Corvette: Used in classic V8 Corvettes, including 1965 Fuel Injection models.Pontiac: Used in 1932-1933 models.Other: 1951-1953 Packard "Junior" models using Delco ignition.
These "green stripe" plugs are pretty old school and may help someone doing a historic/concourse resto .....
"AC "Fire Ring" spark plugs are vintage, often green-ringed, NOS (New Old Stock) or reproduction plugs typically used in older GM vehicles and classic cars, notably in the AC 44 or 42FS series. These are not a modern high-performance technology, but rather a classic, reliable spark plug design often sought after for authenticity in restoration projects".
Free to anyone or their mate who could use them ..... let me know.