This looked really simple to replace, but the replacement bulb I got from halfords yesterday had the bayonet mounts slightly offset to each other whereas on the fitment socket on the car, they are directly opposite each other. So although the bulbs look identical, they clearly arn't.

I bought bulb type 581 - anyone know which type number I need.

 

P21W with opposite pins

 

382 bulb should be the one
std 21w indicator bulb,