'65 Barracuda Interior moldings under rear window
My 65 has plastic covers only over the end caps. The center is painted metal with the slots described above. The center piece is painted black. Mine has its original paint. (The rest of the interior metal except for the dash has been repainted, but the center rear piece is the original paint.) As far as I know NONE of the interior metal of ANY 65 or 66 Barracuda was originally painted body color; it was always painted the interior color (my Barracuda originally was white with a black interior). I have seen "restored" 65 and 66 Barracudas, though, with body colored interior metal.
I have owned my 65 since August of 1968, when it only had 35,000 miles on it.
I used to have a gold 66 Barracuda, with a white and brownish/gold interior. The back piece was painted metal to match the rest of the interior metal. Can't remember now whether it had the slots or the plugged holes.
This is my 65: