Dorman 42124 Headlight Adjusting Screw

Headlight Adjusting Screw for Sealed Beam Headlamps

Dorman 42124 is a specific-fit headlight adjusting screw designed to match the original part’s fit and function on selected vehicles. Built from metal and plastic materials, it provides a direct replacement for sealed beam headlight adjustment hardware where precise aiming is needed.

Compatible With 1976-1979 Cadillac Fleetwood, 1976-1979 Cadillac Seville, 1976-1978 Cadillac DeVille, and 1976-1978 Cadillac Eldorado applications that use sealed beam headlamps. The Dorman 42124 headlight adjusting screw supports accurate headlamp alignment on these Cadillac models.

• Specific fit for selected Cadillac headlight assemblies
• Designed for sealed beam headlight systems
• Adjustable screw-on design for headlamp aiming
• Constructed from metal and plastic materials
• Direct replacement for original-style adjustment hardware

Detailed Product Overview

This headlight adjusting screw is engineered to restore the adjustment point used to aim sealed beam headlights. On 1976-1979 Cadillac Fleetwood and Seville, as well as 1976-1978 Cadillac DeVille and Eldorado models, the part helps maintain proper headlamp positioning after service, wear, or replacement of the original hardware. Dorman 42124 is a practical OE-style solution when the factory adjuster is damaged, missing, or no longer holds alignment.

This part cross-references 421242 and 4006204 for the same application.

Common Uses

• Broken or stripped headlight adjuster threads
• Loose headlamp aim on sealed beam systems
• Missing original adjustment screw hardware
• Uneven headlight beam alignment after repair
• Restoring adjustment function on classic Cadillac lighting assemblies

Installation Notes and Tips

Verify sealed beam headlight configuration before installation. Match the original adjuster style and thread engagement to the existing headlamp bucket or mounting point. Because installation hardware is not included, reuse serviceable related components or source the required mounting pieces separately as needed. Confirm headlight aim after installation to meet vehicle lighting requirements.

Quality Assurance

Dorman designs this part to match the fit and function of the original component on specified vehicles. The construction and application-specific design support reliable operation in the intended Cadillac headlight assemblies.