Peterbilt 379 Frame Light Bars & Filler Panels

Frequently Asked Questions About Peterbilt 379 Frame Light Bars & Filler Panels

What are frame light bars and filler panels used for on a Peterbilt 379?

Frame light bars and filler panels are mounted along the truck's frame rail, typically between the cab and fuel tanks or along the rear of the chassis, to close gaps and provide a finished look while housing marker, clearance, or accent lighting. They help cover exposed frame rail sections and give the truck a cleaner, more polished appearance.

Will a frame light bar or filler panel fit my specific Peterbilt 379 configuration?

Fitment can vary depending on frame rail spacing, wheelbase, fuel tank size, and whether your truck has factory or aftermarket tanks. Before ordering, measure the gap you're looking to fill and compare it to the product's listed dimensions. If you're unsure, reach out to our team with your truck's specs so we can help confirm the right fit.

What materials are these panels and light bars made from, and what finish options are available?

Most frame light bars and filler panels are constructed from stainless steel or aluminum for durability and corrosion resistance. Common finish options include polished stainless, brushed finishes, and diamond plate textures, allowing you to match or complement the rest of your truck's exterior.

Do these panels come pre-drilled for lights, and what type of lighting do they accept?

Many filler panels and light bars come pre-drilled with holes sized for standard round or oval marker and clearance lights, often in 2 inch or similar common sizes. Some are sold as blank panels without holes for a smoother look. Check the product listing for hole count, spacing, and light size compatibility before purchasing, since lights are sometimes sold separately.

How are frame light bars and filler panels typically installed?

Installation generally involves bolting or welding the panel to the frame rail, depending on the specific product and mounting brackets included. Bolt-on panels are more common for aftermarket parts since they allow for easier removal and don't require modifying the frame. Basic hand tools are usually sufficient, but if the panel requires wiring for lights, you'll also need to run and connect the appropriate wiring harness.