BlackFox5.0,
That is the 92-93 design light. It installs a bit differently than the SN95 light. Mine was from a 95 model. I had one of the 93 lights in my car for several years. It actually uses a different mounting bracket on the roof than the 87-91 rectangular lights. I had to cut a bit on the light and rig up some screws to mount it, and it still didn't fit flush. I was happy to change it for the SN95 one.
Legendary,
I got mine with the light assembly, and it also had a rectangular plastic bracket that was above the headliner in the 95 and the light just snapped right into it. I hope you got that part of it. The bracket and the light kind of sandwich the headliner and that holds it in place. All I had to do was insert the backing bracket above the headliner, it is a bit bigger in size but fits right inside the hole when turned on end. Then the light assembly snapped right into place. If you don't have that part, you might be able to use screws through the lens to hold it into place. But luckily it does not need the wires to be screwed through the lamp to install it.
Good luck!