According to the 2001 Ford F-150 Owner Guide : Each headlight has ( 1) # 9007 bulb
9004
Are you asking how to replace the entire headlight assembly -OR- how to replace just the headlight bulb? Just the bulb.
I'm not positive, but most Ford trucks now have a bulb that can be replaced by opening the hood and coming to it from behind the light. The bulb receptacle usually twists one way or the other to loosen
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Dealer
According to the owner's manual - headlight bulb # 9007