Buyers Products Fleet Series Drill-Free Light Bar Cab Mount for GMC-/Chevy® Pickup Trucks eliminates the need to drill mounting holes in your cab’s roof. The rooftop mount conveniently bolts into the holes for your vehicle’s OEM third brake light. The one piece construction makes installation quick and easy, and your vehicle’s OEM brake light screws back into your vehicle’s hardware once the install is complete. The mount’s low-profile design provides improved aerodynamics to minimize drag while you’re on the road. NOTE: Drill-free cab mounts are not compatible with vehicles equipped with OEM strobe lights in the third brake light area. Not recommended for trucks with LED brake lights.