Vehicle specific fender bracket, no holes to drill. Drivers side installation only. Uses the existing fender bolt and fits between the hood and fender gap. 3/4″ hole accepts the standard NMO mount Note: For stability, our brackets are made of 14 gauge stainless steel. Most NMO mounts are designed for installation through thin sheet metal, the thickness of our bracket makes it difficult for some NMO mounts to be cambered into place. The Larsen NMOK mount does not have any problem. Fits these vehicles: Chevrolet Avalanche 2007-2013 Silverado 1500: 2007-2013 Silverado 2500, 3500: 2007-2014 Suburban 2007-2013 Tahoe 2007-2013 GMC Sierra 1500: 2007-2013 Sierra 2500, 3500: 2007-2014 Yukon and Denali: 2007-2014