This is the 2012 Chevy Silverado 1500 hi-flow body from JConcepts.
Includes: 2012 Chevy Silverado 1500 Hi-Flow Body with Full Color Body Trim Decals and Window Mask Sheets
Length: 20 (508mm)
Width: 9.6 (244mm) at narrowest point behind front wheels, 12.6 (320mm) rear wheels at widest point
Height: 5.3 (136mm)