Bulbs - standard type available from your local Halfords, or any car parts shops (even Asda, Tesco etc).
Take the old bulb with you to make sure it's the same type

(most of them... indicator, reverse, fog light are all 12v 21w. It's only the brake/tail light which is a different bulb, which if I remember correctly is dual filament 12v 21/5w)