Trim Identification Needed

Any idea what the rear glass pieces might be off of? You can sort of see in the later pictures how it doesn't match the curve of my rear glass very well. Is this another 2 door post / 4 door thing or a different year or platform (B, E body, etc.) thing? Also, what all years used the trunk trim piece? Are there supposed to be two of them total, like one at the top and one at the bottom connecting the tail lights?