IF you get the new header panel they attach with two screws on the top of the housing and two on the bottom.
If you cut up your current header panel, here's when I did mine:
Installing 05-06 headlamps on a 99-04 SD - Competition Diesel.Com - Bringing The BEST Together
Also, the 05-07 heads only have vertical beam adjustment. It's the torx looking screw sticking up. You can use a 5/32" 6 point socket to adjust them.
Hope this helps.
