The Owner’s Mannual for the Fiat 500L instructs you to turn the Daylight bulb holder clockwise to remove it. This is incorrect. The holder is very stiff but I found carefully inserting a pair of pliers just above the wheel then firmly turning them anti-clockwise will release the holder. The bulb can then be easily pulled out and replaced with a W21 5W bulb (£6 a pair in Halfords) The holder should then be turned clockwise (no pliers required) until it clicks into place. I found placing a torch on a chair really helps and frees up the hands to replace the bulb.