Given it's a sealed unit. I doubt that any of the users here will have taken one apart to measure.
Blinging up cars is not something we see much of here.
Assuming that this is a light that does not have the LED DRL's built in. That could be a upgrade path. But you would be looking at factory fit units to ensure MOT compliance, if Kia do make something that would fit. GIven the age of the car (guessing from the age range this is posted in), they have gone through many revisions that will see changes.