AUXMART 2007-2013 Chevy Silverado/GMC Sierra Steel Metal Upper Roof Windshield Mounting Brackets for 50 Inch Curved Led Work Light Bar SUV Off-Road (1 Pair) Notice For 50" Curved light bar. Will not Fit 50'' Straight Light Bar. Please measure your light bar. InstallationSolid black steel construction. Minor drilling may be required for mounting. Aerodynamic designFirmly hold the light bar above the top of windshield,will not obscure your view of roadway Fitment(2WD/4WD)2007~2013 Chevrolet Silverado 1500 Pickup / 2007-2014 Chevrolet Silverado 2500HD 3500HD Pickup / 2007~2013 Chevrolet Tahoe / 2007~2013 Chevrolet Suburban / 2007~2013 Chevrolet Avalanche / 2007~2013 GMC Sierra 1500 Pickup / 2007~2014 GMC Sierra 2500HD 3500HD Pickup / 2007~2013 GMC Yukon / 2007~2013 GMC Yukon XL Compatible with 50" curved light bar with 5/16(8mm) post Part Number70507,70521