Re: casting number
d4 - 1974
d - Maverick (1970-74)
e - engine
8016 - 8000-8499 = Radiator and grille
aa - Single letter indicates specific application. Increases alphabetically (A, B, C, etc.) for each minor revision (same prefix and basic part number) and then double letters (AA, AB, AC, etc.) when all single letters are used.
3l28 could be a date code - November 28, 1973
not sure if these are correct maybe someone else can check them over.
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