On my dad's set. the headlights wouldn't fit without us redrilling the holes slightly in the fender (the sides of the headlamps).
Also whenever I would bolt it down and then back the bolt back out, the "female" bolt that screws into the plastic backed out of the plastic, disabling me from unbolting it. This happened on a few on them.
Plus the corners fit funky and you know when you "pop" them into the headlamp assembly, its a pretty tight fit? The Depos never really "clicked" in, they just kind of worked in there.
Plus I forgot to mention that the inner main bulb reflector peice has since popped off and is bouncing around in the assembly.
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Things to note:
1. My dad's front end or fenders have never been replaced.
2. I have put an OEM Tsuru on a 91/92, I have put an OEM 93/94 on a 91/92, and I have gone from a Tsuru back to a 93/94 on the Rallycross car. So inexperience isn't an issue.
As a side note, I spotted a B14 with ebay Taillights the other day and they were both fogged up inside.