Everyone in the US has done it, except those that didn't .
The bulbs are not there nor the sockets. You have to buy anything that will fit. You can re-use the factory bulbs from the stalks, or replace them w/ LED's.
IF you go the LED route you will also need an electronic relay (3-5 bucks on Ebay) or your lights will flash like a disco ball. (way too fast).
It's a good idea IMHO to replace all the bulbs w/ LED's to save wear on your battery, and charging system. They draw sooooooo little that the entire bike stays brighter, and expendables last longer.