42mm x 11mm festoon, i believe its also known as a 264 bulb size.

If you thinking of getting a LED one be wary, i got one for my car and it has 3 LEDs, looks good, but the light it gives off is poor if you actually want to find something in the car in the dark!!

I usually put the original one in during the dark months!

EDIT: I should also point out that i got a RED coloured one, so maybe a white or blue one might be better,
or look for one with more than 3 LEDS, plenty of room in the light so if it was a bit wider than the original [11mm] it would still fit
id say.
 
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Its also worth noting... when you're fitting it, test it using your door the usual open close, and make sure that the bulb actually goes off. LED can draw tiny amounts of current, and stay on very faint all the time.