Use the search term 'taillight assembly' as this seems to be the more popular term for this part.

And the ones I have seen use one type for the right and one for the left, or maybe there are just two type of assemblies. One has a plastic lens that will allow light to be projected into the trunk area when the headlights are on. I would think that you could find a right and a left assembly with this lens but they usually only came with one side or the other.