valeo single-plate clutch mechanism compatible with bertolini for walking tractor mower tractor models series 421 series 424 diesel ( 1 and 2 cylinders ) series 428 series 431 series 432 diesel ( 1 and 2 cylinders ) series 450 ferrari for walking tractor mower (transporter) tractor models 45 sinter 74 1st series 75 1st series characteristics single-plate 㘠180 mm with diaphragm code: 50133 original code: 81.9134.00 81913400 em