My head is spinning after reading through this, I'm still not sure the original poster knows what he has or what that is.
On the 67 there are 3 separate pieces of trim.
A skinny one along the top.
The wide one in the middle
Another skinny one along the bottom
The area between them in the painted sheet metal trunk lid.
1967
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On the 68 there are 2 pieces of trim.
Both are about 2" wide with polished edges top and bottom and painted between them.
One along the top of the trunk.
One along the bottom of the trunk.
On your car the 68 trim has been painted red, the polished portions are part of that trim.
The area between them that is black in the trunk lid itself that has had that area painted black.
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Save yourself some headaches and get the correct 67 trim.
Alan