Even if they were required to have a 3rd stop light for 1994, some pick-up/SUV/vans did had them before that year. Here is the list that i remember, anyone who finds one that is not on the list is welcomed to add it

Ford Econoline-1992
Ford Explorer-1991
Toyota Previa-1992
Chrysler minivans-1991
Nissan Pathfinder-1993
Isuzu Rodeo-1993
Isuzu Trooper-1993
Ford Ranger-1993
Mercury Villager-1993
Nissan Quest-1993