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The seal on the top of the radiator support of my 67 390 GTA convertible was attached with screws instead of staples or clips. The radiator support has never been replaced (in fact, it still has a big S and D written in grease pen in front of the battery area presumably to denote the S code engine and dual exhaust), and I'm pretty sure the seal itself is original to the car as well.
........... I think the "D" has to stand for something more than "done"...If not for Dual Exhaust or Deluxe Interior, maybe it stood for Disk brakes?Just speculating...