It was easy.. I cut the frame horns flush... The ebay ones bolt in.. But its best to weld them.. I just left them bolted.. 2003-2007 sierra/2003-2007 Silverado use the same frame horns
Frame horns were ordered off ebay..2003-2007 classic,they slide in after you cut your older style ones off..and you can put 1 bolt in each side unless you weld them