Kia K5 Side Marker Bulb Size

Additional Notes

• The Kia K5 uses the 12961 bulb for its side marker positions across the 2021-2024 model years.
• The 12961 is a Philips part number designating a T10 miniature wedge bulb with a W2.1x9.5d base, rated at 12 volts and 5 watts.
• The T10 form factor is a small tubular bulb type widely used in low-intensity automotive lighting positions such as side markers, parking lights, and interior applications.
• The W2.1x9.5d base designation describes a wedge-style connection where the bulb's glass envelope itself acts as the retaining element, requiring no separate metal base or locking mechanism beyond the socket's spring tension.
• At 5 watts, the 12961 operates at a low power draw consistent with indicator and marker functions rather than primary illumination roles.
• The W2.1x9.5d base is a standardized international socket type, meaning physical fitment compatibility extends to any bulb sharing that base designation, provided the voltage and wattage ratings are also matched to the circuit requirements.