LED versions of those cylindrical festoon bulbs all seem to be sold by length, so like BlueBeast said, just measure them and find the closest size, but don't go over. I replaced my license plate lights and all of the interior bulbs with LEDs. I got most of them from store.jdmtoy.com. My front dome lights were from eBay. They have to shine at a right angle, and after a bunch of searching, I finally found out that they call them "flank bulbs".