Combine Harvester 3D model 10 (Polygon mesh 3D model) is available on CGTrader for $139. Original author: 3D-Horse. Specs: 1663503 polys, 1700227 verts.
OBJ (OBJ, filesize: 82.3 MB), LWO (Lightwave, filesize: 33.6 MB), C4D (Cinema 4D, filesize: 27.7 MB), MAX (Autodesk 3ds Max, filesize: 88.3 MB), 3DS (3D Studio, filesize: 33.1 MB), MA (Autodesk Maya, filesize: 59.3 MB), HRC (Autodesk Softimage, filesize: 42.4 MB)