T5.8mm (T-1 3/4)
Bulbs of this type are commonly used in automotive lighting and in low-voltage lighting used in landscape lighting. The bulb may have dual filaments, acting as both a low-wattage tail light or parking light and a higher-wattage brake light or turn signal. In this case, one has its contacts near the center of the base, and the other toward the outside edges, so that they cannot be accidentally swapped. Along with putting contacts on the opposite (alternating) sides, this gives the base rotational symmetry so that the user does not have to determine the exact position of the bulb before inserting a new one.