You can replace the bulbs from there holders but as they're hard to solder in you can't guarantee continuity all the time (one of mine comes on for a day or two then off again!). Someone sells them on ebay for a few quid for a complete set already in holders. Make sure you test they all work before you re-fit clocks and speedo cable as that's the hardest bit. The bulb holders turn in a quarter/half turn, anti clockwise to remove.
