Pre-98 lights will fit with no problem. They will not 100% match up to the center reflector though. The Pre-98 lights along the top just go straight across, while Post-98 rise up a tiny bit to line up with the beginning of the reflector. No one notices it though unless you point it out.
I have a Pre-98 trunk with Post-98 outers, and so far I'm the only one to notice until I point it out.
I wish I could tell you which lights would be your best option for the LED setup but I have no clue. This is a mod I've wanted to do myself also, just don't much time to research it and figure out what I need.