1/25 Chevy Bison TractorAMT 1390 1 25 AMT CHEVROLET BISON CONVENTIONAL TRACTOR SCALE MODEL KIT A BIG TIME CHEVY IS HEADED YOUR WAY: AMTs 1 25 scale Chevy Bison kit is a great project for any experienced big rig modeler whos into the Chevy brand. Add it to your collection today! BIG ON DETAIL: At 12. 75 inches long, the Bison builds big with a load full of authentic features, including 60+ chrome parts, a 34 inch sleeper, Detroit Diesel 8V92T engine, tilting hood, dual chrome