2PCS 52'' LED Light Bar Mounting Brackets - for Mounting Offroad Lightbar on Upper Windshield, Compatible with 2007-2013 Chevrolet Silverado Suburban Avalanche Tahoe & GMC Yukon Sierra
Lock tooth washer recommended when mounting light bar with just one mount hole to prevent light bar from rotating
Heat sink fins on the light bar will produce whistling wind-noise at high speed. It is NOT related to the brackets or the mount position. Google search "light bar wind noise" to view various simple and inexpensive fixes to this problem