Set your headlight aim and help it hold there with the Dorman headlight adjusting screw, part number 42185 from the Dorman HELP line, made for sealed-beam headlamp adjusters. It fits many vehicles, among them the 1979-1986 Ford Mustang, 1991-2001 Jeep Cherokee and 1991-1992 Jeep Comanche. See the "Vehicles it fits" section for the full list and engine details.
The adjusting screw threads into the headlamp adjuster. Turning it moves the sealed-beam headlamp so the beam can be aimed correctly. Dorman designed this screw to fit and work like the original screw, so it installs as a direct-fit replacement for the listed applications.
- Direct replacement: built to fit and work like the factory adjusting screw on the listed applications.
- Practical fix: replaces an original screw that is missing, broken or worn out.
- Durable construction: made from quality materials for dependable performance.
- Backed by expertise: supported by Dorman's team of product experts in the United States and more than a century of automotive experience.
Signs this part may need replacing: a headlamp that will not hold its aim, an adjuster that turns without moving the light, or a screw that is stripped, broken or missing. If a worn adjusting screw is the cause, this part replaces it. Re-aim the headlamps after installation.
Interchange: 55054621 · 55054621AB · D8BZ13032B · 421852
This part cross-references / interchanges with the following part numbers:
55054621, 55054621AB, D8BZ13032B, 421852
Frequently Asked Questions
What does a headlight adjusting screw do?
It is the threaded screw in the headlamp adjuster that sets the headlight's aim. Turning it moves the sealed-beam headlamp so the beam can be aimed correctly.
Does Dorman 42185 fit a 1979-1986 Ford Mustang?
Yes. It is listed for the 1979-1986 Ford Mustang, and also for the 1991-2001 Jeep Cherokee and 1991-1992 Jeep Comanche. See the "Vehicles it fits" section for every listed vehicle.
What type of headlamp is this adjusting screw for?
Dorman lists part 42185 as a headlamp adjusting screw for sealed-beam adjusters on the listed applications.
What are signs the adjusting screw may need replacing?
Signs include a headlamp that won't hold its aim, an adjuster that turns without moving the light, or a stripped, broken or missing screw. Inspect the adjuster to confirm the cause.
How is the headlight adjusting screw installed?
Remove the worn screw, thread the new one into the adjuster, then re-aim the headlamp. Follow the vehicle service information for the procedure and aiming specifications.
