Specifications include, but are not limited to:. New one set of Mattracks 5000 series rubber track systems or Agency approved equivalent. Track systems must include front and rear set of four track systems designed and certified for a 2020 John Deere 4066R tractor. 4 rubber tracks with matching mechanical drive & suspension systems. Front track systems will be: 16” wide, total width. 31.60” height, ground to top of track. 52.11” length, outside front of track to outside rear of track 19.90” height, ground to center of sprocket. 12 - 8”x 2.5” idler wheels Must be equipped with Rubber Torsion and anti-torque devices Frame Construction shall be Structural Steel Track assembly must be equipped with concentric pivot with rocker arm Steel frame will be yellow in color Rear track systems will be: 16” wide, total width. 43.53” height, ground to top of track. 62.28” length, outside front of track to outside rear of track. 26.35” height, ground to center of sprocket. 14 - 8”x 2.5” idler wheels