Been using these to light a few slots. They work very well, and work at voltages from 8 to 16 without any issues. They are pretty small at 5mm, and can be easily adapted to most car bodies. I also used them for my caution lights around the track on my oval. available in several colors too.Very bright, and pre wired, plus you sure cant beat the price. Thought ya'll might find them useful.
http://www.ebay.com/itm/310954071636?_t ... EBIDX%3AIT