Comes with Custom Mounting Brackets for front and rear flaps, Stainless Steel Weights and Anti-Sail Brackets for rear flaps
Appears to have all hardware listed on instructions
Fits 2001-2006 Chevrolet 2500HD/3500 Dually and 2007 Chevrolet 2500HD/3500 Dually Classic body style
 
Fronts: 12"x24" Rears: 19"x24" Mud Flaps are new part but old stock.  Some minor damage from storage shown in pictures and is reflected in price. Front and Rear brand new are $240 or more.