Peterbilt 375/377 Frame Light Bars & Filler Panels

Frequently Asked Questions About Peterbilt 375/377 Frame Light Bars & Filler Panels

What exactly are frame light bars and filler panels used for?

Frame light bars and filler panels mount along the truck's frame rail, typically between the cab and rear wheels or in the area around the fuel tanks, to close off gaps and provide a mounting surface for auxiliary lighting. They serve both a cosmetic purpose, giving the truck a cleaner, finished look, and a functional purpose by housing marker lights, step lights, or accent lighting.

Will these panels fit my Peterbilt 375 or 377 without modification?

These panels are designed to match the frame dimensions and mounting points of the Peterbilt 375 and 377 models, but fit can vary depending on your truck's specific frame length, fuel tank configuration, and any prior aftermarket modifications. We recommend checking the listed specifications and measurements against your truck before ordering, and reaching out to our team if you're unsure.

What materials and finish options are available?

Frame light bars and filler panels are commonly offered in stainless steel or aluminum. Stainless steel options are typically available in polished or brushed finishes for durability and a long-lasting shine, while aluminum panels offer a lighter-weight alternative. The best choice depends on your budget, desired appearance, and how much maintenance you're willing to do to keep the finish looking sharp.

Do these panels come pre-drilled for lights, and are the lights included?

Many filler panels come pre-drilled with holes sized for standard light housings, but this varies by product, so check the individual listing for hole count and spacing. In most cases, the lights themselves are sold separately unless the listing specifically states they're included, so plan to order compatible lighting separately if needed.

How difficult is installation, and what tools will I need?

Installation generally involves bolting the panel or light bar to existing frame mounting points, and in some cases running wiring if lights are being added at the same time. Basic hand tools, a drill if additional holes are needed, and standard wiring tools for connecting any lights are typically sufficient. Most installers with basic mechanical experience can complete the job, though wiring work may take extra time depending on your truck's existing electrical setup.