First caveat, I am sure there have been changes from '92 to '98, but I looked in my manual so here goes anyway.
I have 3 fuse boxes:
· Engine Compartment – near air cleaner housing
· Under Hood – passenger side toward the front of car
· Interior – driver side under dash near clutch
If your problem existed on a ’98, it would either be fuse #19 and #21 Under Hood -or- #3 and #5 Interior.
With all that said, the lights that went out on your NSX are run by different fuses on the ’98, which assuming NO CHANGES between ’92 and ’98 would make me think your problem couldn’t be a fuse – what are the odds of 2 fuses blowing at the same time? However, it is likely that in ’92 the 2 lights are run by the same fuse, you will just have to look.
The only other thing I can think of is a plug came loose behind your light assembly and this plug powers both lights? You said they are on the same side, so this is possible, but you will just have to look.
I hope that helps.