I get the bulbs at the dealer.
Make sure you are wearing surgical gloves (no contact with the bulb) and that you have plenty of light - and time! The instructions are in the manual - and it is VERY fiddly. The rear cover is held on with two clips - be careful here - and then pull the plastic cover off (I let it fall down in situ as it won't easily come completely free from the gubbins clogging the area) and unclip the bulb. This is bloody fiddly and you will swear. The two clips are flimsy and you'll think you'll break them. Please be careful. Remove the old bulb, remembering to look carefully where the lugs locate. Fit the new bulb and clip it back in place - and refit the backing cover making sure it sits in its groove securely.
Don't give up. It is possible on both sides of the car without removing anything , and practice speeds up the business.
Remember - you need to see and a torch might be handy.
