Festoon Dome Lights
Scroll 1/5 of the way down the page until you get to High Powered 5050 3 Chip SMT LED (the one with Canbus chip). They are $12.99 each in Cool White / 36mm. I can't recommend them more - never had a code, never had a problem with installation, they always work, etc. The housing doesn't get overheated, yet it's a bright white light (makes its mark on the ground at night). Don't bother with other bulbs.
-Cyrus