The Kia Forte Koup side marker requires a bulb size of 12961 for the lighting assembly. Data for the specific bulb requirements covers the range from 2015 to 2016.
The year-by-year compatibility chart below provides a quick reference to verify the correct bulb size for your vehicle.
The 2357 bulb is the most consistently used type across the Kia Forte Koup's side marker specifications, appearing in the rear side marker position for all model years from 2010-2016.
The 2357 is a dual-filament bulb rated at 12V with a high-filament draw of 26.9W and a low-filament draw of 8W, mounted on a BAY15d bayonet base.
The 2357 is a brighter variant of the 1157 bulb, sharing the same BAY15d base type and dual-filament configuration.
The front side marker position on the Kia Forte Koup uses two distinct bulb types depending on the model year, with the 2357NA specified for 2010-2013 and the 168 specified for 2014-2016.
The 2357NA is the natural amber glass version of the 2357, sharing the same 12V, 26.9W/8W dual-filament rating and BAY15d bayonet base, but with factory-tinted glass rather than a clear envelope.
The 168 is a miniature wedge bulb in the T10 form factor, rated at 12V and 4.9W, representing a significantly lower wattage than the 2357NA it replaced in the front side marker position.
The 2357NA and 2357 share identical electrical ratings and base types, meaning the only physical distinction between them is the amber glass coating on the 2357NA.
For the rear side marker on 2014-2016 models, the 2357 fitment is noted specifically for vehicles equipped with halogen capsule headlamps, indicating a headlamp-type dependency for that position in those years.
The 168 and 2357NA are not interchangeable despite both serving the front side marker function in different years, as they differ in base type, wattage, filament count, and physical form factor.
All bulb types listed across both sub-parts conform to ANSI standards applicable in the United States and Canada.