Check out the first page.. Links are good.. The XB's are the brightest and fit the best. 90mm is the size you want for the main projection shroud. Very easy to do, don't pay a crap load of money to have them done. Plenty of guys in this thread that are willing to help..
Also need to think about the color. That will effect the way you wire it up. White Halos, you can use your parking light switch. Colored halo's you will need to wire them to a switch, that means mounting it inside the car somewhere. Recommend a switch with a light on it so you know if its on or off since colored halos are illegal to us on the roads.
Hope this help you out some..
http://www.the370z.com/diy-section-d...-led-halo.html