Anima89,
Welcome to the forum. I would like to suggest you start a thread for your restoration, but I think you may not be able to until you have made a certain number of posts. When you're able to start a thread, please keep us posted.
Correct, yours could be European standard - one backup light, one rear fog light.
I remember seeing a second-gen with backup lights on the tailgate, one where that red light is on yours. and another on the right side.
Those red lights on the bumper maybe European standard rear fogs, low on the bumper so people do not mistake them for brake lights.
Examples:
You may just have to find clear lenses like this:
1990-1995 Toyota 4-Runner 4Runner Taillight Taillamp Back Up Tail Light Backup Reverse Lamp Pair Set Left Driver And Right Passenger Side (90 91 92 93 94 95 1990 1991 1992 1993 1994 1995) | 4 Wheel Parts - Bumpers - Floor Mats - Portable Freezer Frid