1965 Dartcharger

Disassembled the inner quarter moulding where the inner roof rail moulding ends tonight.
My Dart Charger assembled in January of 65 has a screwed in place aluminium plate to cover the lower part of the roof rail.
However my Dart Charger assembled in mid December of 64 had a glued piece of black foam instead in place.
This means that there were a change in production between mid December of 64 to late January of 65.
Learned something new today.

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Any idea what that foam is for? I was wondering about that when I took my '66 apart.