[Accelo]

Davidf; You nailed it.

What I thought was incorrect. there are two tabs both top and bottom and they have nothing to do with alignment. I dug out my originals and this proved to me they indeed do not have matching holes. The issue is the gasket I was provided for the tail lights is about half the thickness it needs to be. I have added pictures of two gaskets. I admit one if for the front light but I believe the thickness is what matters and is backed up by a visual inspection of the old gasket. No way this works unless maybe one purchased two sets and glued them together. Pictures show the two different gaskets from two different companies. Also show up against the lens tab to highlight the discrepancies.
Just crap parts that would never keep water out per the original design.
However I stand by my suggestion, don't purchase from Pony parts!