OPT7 xMount 50" Straight LED Light Bar Top Roof Mount Mounting Brackets Kit for 1999-2006 Cheverolet Silverado / GMC Sierra OPT7 xMount Light Bar Brackets feature: Precision Alignment, 360 Custom Adjustibility, and Extreme Durability Mounts 50-inch straight light bars on upper windshield/roof Made of special high-strength, stainless steel for extreme durability xMount Brackets are formed specific to your vehicle for precision alignment Unique, weather-proof coat surface finish makes OPT7 brackets impossible to corrode and withstand the harshest weather conditions