PLUG AND PLAY WIRING HARNESS NO SPLICING!!!!CONVERT YOUR 1999-2004 SUPERDUTY OR EXCURSION TO LOOK LIKE A 2007 WITH A BRAND NEW SET OF BLACK HARLEY 2005-2007 OEM STYLE HEADLIGHTS AND OUR H13/9007 HARNESS.  YOUR PRESENT SOCKET IS A 9007, JUST PLUG IN OUR WIRING HARNESS  ( SUPPLIED WITH THIS KIT ) ONE SIDE OF THE HARNESS WILL PLUG INTO YOUR 9007 SOCKET AND THE OTHER SIDE WILL PLUG INTO THE H13 BULB IN THE NEW HEADLIGHT. YOU WILL ALSO HAVE TO CUT OUT PART OF THE FIBERGLASS HEADER PANEL BEHIND THE HEADLIGHT ( instructions included).   ALL THE MOUNTING HOLES ARE EXISTING, but you will have to purchase 2 bolts and clips to mount the top of the headlight.  THEY FIT ALL F250 F350 F450 SUPERDUTY TRUCKS with composit headlights ( not sealed beam vehicles). THE HEADLIGHTS COME WITH ALL THE  BULBS . THESE ARE COMPLETE ASSEMBLIES READY TO BOLT ON TO YOUR TRUCK,  .  THEY ARE SAE & DOT APPROVED AND STAMPED