Frequently Asked Questions About GMC General Truck Frame Light Bars & Filler Panels

What model years do these light bars and filler panels fit?

Our GMC General truck frame light bars and filler panels are designed to fit 1977-1987 GMC General models. However, fitment can vary depending on your specific truck configuration and any modifications made over the years. We recommend checking your truck's frame width and measuring the mounting points before ordering. If you're unsure, contact our support team with your VIN and truck specifications for verification.

Are these light bars made from steel or aluminum, and will they rust?

Most of our GMC General light bars are constructed from heavy-duty steel with either a chrome-plated or powder-coated finish for corrosion resistance. Chrome options provide a mirror-like finish but require regular maintenance to prevent pitting. Powder-coated options offer superior rust protection and durability but have a matte appearance. For maximum longevity in harsh climates, we recommend applying additional rust preventative coating to any mounting points or areas where the finish may be compromised during installation.

Do I need to drill new holes or modify my frame for installation?

In most cases, our light bars utilize existing frame mounting points on 1977-1987 GMC General trucks. However, some installations may require minor drilling for light wiring access or bracket adjustment. The installation typically takes 2-4 hours and requires basic hand tools, a drill, and ideally a helper to position the bar during mounting. Professional installation is recommended if you're uncomfortable with frame work or electrical connections.

What's the difference between a light bar and a filler panel?

A light bar is a functional accessory that mounts between your truck's frame rails and includes pre-drilled holes or mounting provisions for auxiliary lights. Filler panels, on the other hand, are decorative pieces that fill the gap between frame rails without light mounting capabilities. They provide a clean, finished appearance. Some customers use filler panels when they want the aesthetic improvement without adding lights, or as a temporary solution while planning their lighting setup.

Can I mount any type of lights on these bars, and what size lights fit?

Our GMC General light bars typically accommodate standard 4-inch, 6-inch, or 7-inch round lights, depending on the specific model you choose. Most bars are pre-drilled for common light spacing patterns, but you can also drill custom holes for your preferred light configuration. When selecting lights, ensure their combined amperage doesn't exceed your truck's electrical system capacity. We recommend LED lights for lower power consumption and longer life. Always use proper gauge wiring and include appropriate fuses or relays in your installation.