They turned out to be a nice kit, the only thing it lacks is instructions, but they do have them on their website. The hi/low kits come with a relay harness, or you can purchase it as an option to a high or low only kit. The 9004/9007 are the same kit, they mount differently in the adapter. My brother put his in the day after Christmas and they work well, I'll try to get some pics of how they work sometime this week.
I'm gonna order the 9004/9007/880's for mine soon, but I've gotta figure out whether I want hi/low kits for both the 9004's and 9007's. Then I'll have to figure out how to modify or get rid of the Brite-Box since it keeps my low beam's lit while my high's are on.
