• LH driver and RH passenger side
  • Smoked look
  • Includes lens, housing, and mounting panel
  • Includes integrated parking/marker lamp
  • Does not include bulbs or wiring
  • Correct for 01-04 models, but will fit 99-00 models
Fit guaranteed
  • This pair of headlamps will install just as your originals do. You can use your existing hardware and wiring harnesses.
  • Save time and money with a direct fit. No trips to the hardware store or extra time trying to get the wiring to hookup.
  • 1A Auto has the most comprehensive warranty.
  • If this headlight set should fail to provide satisfactory performance you may exchange it.
  • 1A Auto Headlights are guaranteed to pass inspections in all 50 states. DOT (U.S. Dept. of Transportation) and SAE (Society of Automotive Engineers) approved.
  • Replacing discolored, scratched, dull or damaged headlights with a new pair from 1A Auto can increase your resale value by up to 10%.
  • A new pair of headlights can provide you with up to 50% more illumination than a dull, yellowed, sandblasted, broken or scratched headlight.
    • 1A Auto headlights can help you see farther at night and in poor driving conditions.
    • A new pair of headlights from 1A Auto can make you more visible to other traffic during heavy rain or wintry weather.

Lifetime Warranty

This item is backed by a Limited Lifetime Warranty. In the event this item should fail due to manufacturing defects during intended use, we will exchange the part free of charge (excludes shipping charges) for the original purchaser. Please keep your invoice for proof of this warranty.

Bulb Note:

These lights do not include bulbs. Occasionally lighting manufacturers do leave test bulbs in the lights. If you happen to receive a lighting product (Headlight, Tail light, Parking light, Fog light etc.) that comes with the bulbs, the bulbs are not covered under our warranty. Our warranty applies only to the light assembly.

  1. step : Handling the Bulbs (0:58)
    • Note: DO NOT TOUCH the bulbs- the oil from your fingers will burn into the light and foul your bulb.
    • Clean with rubbing alcohol and a soft cloth if the bulbs do get touched.
  2. step : Remove the old headlight assembly (1:00)
    • Pull the tabs anchoring the headlight assembly
    • Put a cloth down on the bumper to protect your paint.
    • Pull out your headlight assembly.
    • Unplug the harness and bulbs.
  3. step : Install the new headlight assembly (3:05)
    • Plug in the bulbs and the harness
    • Using a rag to protect your paint, put the headlight assembly into its mounting.
    • Anchor the headlight assembly with the two tabs.

Tools needed for replacement:

    Materials, Fluids, and Supplies

  • Cloth Rags

4.5 / 5.0
2 Reviews
5 Stars
4 Stars
3 Stars
2 Stars
1 Stars
2004 Mustang Headlamps
Watched video and ordered parts and was delighted with quality of the new assemblies. Perfect fit, massive difference to appearance of car and was pleasantly surprised to see that bulbs were already fitted . Very happy to have bought from 1A Auto
August 14, 2017
6 months ago
Excellent! But..
Got my headlights quick and they made my mustang look 5 years newer. Very easy to install. They even came with new headlight bulbs in them! Only problem was one of the headlight bulbs didn’t work, so that was a bummer, but other than that, no complaints! Thanks 1aAuto!
November 6, 2017
3 months ago
Start typing your question and we'll check if it was already asked and answered. Learn More
Browse 1 question Browse 1 question and 6 answers
Do the headlights have vertical and horizontal adjustments?
Jody G on Feb 15, 2016
BEST ANSWER: Things Needed
Allen wrench
Tape measure
Step 1
Park your 1999 Mustang directly in front of a garage door or other vertical surface, turn off the vehicle and prop open the hood.

Step 2
Place a vertical and horizontal strip of tape on the wall in front of the center of each headlight. These strips are marker "crosses" to target the aim of your headlights.

Step 3
Measure 20 feet away from the vertical surface that your Mustang is parked in front of and place a strip of tape at that point. Reverse your Mustang until the headlights are directly over the tape on the ground. Park, turn on your headlights and prop open your hood.

Step 4
Look for the small, black adjustment screw on the inner side of the headlight assembly, near the grille.

Step 5
Insert your Allen wrench into the adjustment screw and twist it clockwise to aim the beam downward and counterclockwise to aim it upward. Aim your headlights so that they hit about 2 inches below and inward of the corresponding cross mark of tape on the wall.

How-to Video:

(04:29 min)

Tools List:

    Materials, Fluids, and Supplies

  • Cloth Rags

This part replaces:

  • OE # 3R3Z 13008 CA
  • OE # 3R3Z 13008 DA
  • Hollander 114-00640BL
  • Hollander 114-00639BR
  • Partslink FO2502177
  • Partslink FO2503177

Vehicle Fit

  • 1999-2004 Ford Mustang Headlight Smoked Style Pair
Part #: 1ALHP00019

Ships Same Day for orders placed by 4 P.M. ET

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1A Auto Parts

Customer Feedback

"Thanks for the fast reliable service. Great price, and the headlights were as good as oem or better!!! Keep up the good work..."
- Dwuan M.
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