Home Products mowers, balers, rakes round baler belts vermeer 504I with traction roller 504I with traction roller 2 Available Products SALE V438A3 - Upper Belt 3-ply smooth, 6" x 438", Clipper lace. For 504I with traction roller. ... SALE V439A3 - Upper Belt 3-ply smooth, 14" x 438", Clipper lace. For 504I with traction roller. ... 2 Available Products