Guys, just installed the new Sport headlights---thought I would just use the 4007's until I got the dual wiring hooked up, but found out the hard way that 9004 wiring doesn't work with 9007's. So the question is do I just change out the 9007 primary that came with the new headlight for 9004 or does someone know the wiring difference for the 9007..... Or do the 9007's gain you anything--if not I'll just use the 9004's..... Hope some one has experience with this change-out... ... . R, J. B. 
