Just fitted some M3 Style rear lights to the E36.The N/S tail/brake light is on the far side,but the O/S the tail/brake is in the middle.
The outside bulb is a 380 double filament bulb and the middle is a 207 single 5w. But for some reason the O/S uses the 207 single 5w as both brake and tail.
I removed both light units and checked each bulb holder had the correct bulb and they did. I cant swap the bulb holders because the tabs are different (middle has 3,outter had 4).