H4 H13 Super Duty Conversion Harness Left and Right Sides included
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This conversion harness is necessary to install 05-07 one-piece Super Duty Headlights.
The 1999-2004 sealed beam socket is an H4, just plug In our wiring harness. One side of the harness will plug Into your H4 socket, and the other side will plug into the H13 bulb of the updated 2005-2007 Super-Duty Headlight.